I bought the Creality 2.2.1 silent board as well, but I wasn't looking to do anything special with it, other than shut my printer up. Mission Accomplished. The stock main board, as everyone knows, was just too dam noisy. Since then, I bought a BTT SKR Pro v1.2 main board, along with some 2209 drivers, supposedly they can do a few things the 2208's cannot. This setup is supposed to be silent as well from what I have seen on YouTube. I am doing this upgrade very very slowly, because the only things I honestly know about doing this, is what I have learned from videos on YouTube. This can be a little intimidating, especially for noobs like me, but if you're persistent, you'll find all the information you need. On a side note, I also upgraded the power supply to a Meanwell 600 watt PSU. Check out YouTuber Kersey Fabrications for the "how to" if you're interested. As it turns out, the E5+ heated bed alone draws almost 500 watts under load.......on a 350 watt PSU. I also bought a buck converter, and a 120mm fan to shut the power supply up. The stock fan on the new power supply is noisier than the original main board was in my E5+.
Kersey Fabrications, Meanwell power supply upgrade https://www.youtube.com/watch?v=2NIcugy7p5k&t=415s
Though I'm not currently running that setup any longer (4 dongles for 2 different towers) I did have a setup doing that very thing. I used a small DIY 8-radial ground plane antenna crudely tuned to approximately 780 Mhz and mounted outside 25 feet high. I'm surrounded by high powered radio broadcast towers so I needed to add filters. The setup was antenna --> feed line --> FM Block --> AM Block --> LNA --> 4-way Splitter --> feeds to the dongles --> dongles (4) --> Powered USB Hub --> Active usb extension cable --> PC
Although the LNA is BIAS-T compatible I was never able to get it to work properly through the splitter so I drilled a hole in the metal case and soldered in power leads from a DROK voltage regulator that itself was plugged into the powered usb hub's power socket. This added the benefit of allowing me to vary the amount of boosting.
The antenna was made using 14 gauge house wire on a lid from a plastic jar, secured with solder, hot glue, and silicone.
I've listed the other parts I used below. The usb hub is no longer available from amazon but it's just a standard powered USB 3.0 hub. If using a hub, be careful of how it's powered. I've found it's better to stay with a wall wart style power adapter but your results may differ. I tried 3 different higher powered usb hubs that use the laptop-style power adapters and they ALL introduced a terrible amount of noise to the setup. The usb extension cable was to distance everything from the noisy pc and its power supply. I also added a bunch of ferrite rings to the ends of every usb cable and to the main feed cable end right before the filters. I don't know how much this helped but at the very least it gave me a positive placebo effect from it. :)
https://www.amazon.com/gp/product/B01N6SWUSJ - Feed Line Cable
https://www.amazon.com/gp/product/B01LE9LRPM - FM Block
https://www.amazon.com/gp/product/B01N9SHS7P - AM Block
https://www.amazon.com/gp/product/B07G14Q6XX - LNA
https://www.amazon.com/gp/product/B0077QMDGY - 4-way Splitter
https://www.amazon.com/gp/product/B07JZ2GQJF - Voltage Regulator
https://www.amazon.com/gp/product/B00VK9PRIU - USB 3.0 Hub - Now discontinued.
https://www.amazon.com/gp/product/B0179MXKU8 - USB 3.0 Active Extender Cable
https://www.amazon.com/gp/product/B07CJMQQWX - Ferrite Rings (though when I purchased them they were only $10)
Found a converter /step down voltage regulator that may help.
DC Buck Module, DROK Adjustable Buck Converter Step Down Voltage Regulator 6V-32V 30V 24V 12V to 1.5-32V 5V 5A LCD Power Supply Volt Reducer Transformer Module Board with USB Port Protective Case https://www.amazon.com/DROK-Adjustable-Converter-Transformer-Protective/dp/B07JZ2GQJF
I'm using this one: https://www.amazon.com/gp/product/B07JZ2GQJF/
Hey there yes you can.im currently running that system on my fountain.
I have a 12v pump connected to a 12v buck converter connected to a 12v timer which is connected to 12v battery which is connected to a 30w solar panel and a solar power regulator.
Timer - JVR 12V Timer Switch Programmable Digital 12 Volt DC/AC/Solar Battery Powered https://www.amazon.com/dp/B00WR0ELCO/ref=cm_sw_r_apan_i_Y0K30EV7A0V7HJQVCSPZ?_encoding=UTF8&psc=1
12v pump - GENEDEY DC 12V Brushless Magnetic Drive Centrifugal Submersible Water Oil Pump Ultra Quiet 800L/H 5M/16ft for Fish Tank Fountain Pool Pond Aquarium Solar Circulation System Water Circulation System https://www.amazon.com/dp/B08NK6VSKT/ref=cm_sw_r_apan_i_30S09FJ5D6C8A8785MRQ?_encoding=UTF8&psc=1
Buck module - DC Buck Module, DROK Adjustable Buck Converter Step Down Voltage Regulator 6V-32V 30V 24V 12V to 1.5-32V 5V 5A LCD Power Supply Volt Reducer Transformer Module Board with USB Port Protective Case https://www.amazon.com/dp/B07JZ2GQJF/ref=cm_sw_r_apan_i_84JE9HRVSEP4QGQKK1J2?_encoding=UTF8&psc=1