You need a USB hub with power like this https://www.amazon.com/AmazonBasics-Port-2-5A-power-adapter/dp/B00DQFGH80

This is the one I used for my laptop: https://www.amazon.com/Anker-4-Port-Portable-Aluminum-2-Foot/dp/B00O0KISQE/ref=pd_sim_147_1?_encoding=UTF8&pd_rd_i=B00O0KISQE&pd_rd_r=489QEWG9DFFXEM0F6PWJ&pd_rd_w=usKGN&pd_rd_wg=cAAL4&psc=1&refRID=489QEWG9DFFXEM0F6PWJ

Idk about the one you were looking at personally, but I can vouch for the one I just put up there. However, I have since switched from laptop to tower gaming and have been using this one since the power adapter didn't matter to me: https://www.amazon.com/dp/B00DQFGH80/ref=twister_B00FB50S0Q?_encoding=UTF8&psc=1

I have never tried an extension of the USB cable, but I have actually used a longer HDMI cable. You could potentially get a longer HDMI cable to plug your laptop into a central location or a location near your chairs and then plug the controllers in that way. Unfortunately I have no experience with USB extensions so I don't want to misguide you with any guesses.

I have a massdrop 02 + SDAC DAC/AMP combo that works via USB connection to a computer. I no longer own a PC and don't really need one. I'd like to play music from YouTube/Spotify or if possible downloaded flacs. What's my cheapest option? A mini PC? Is it possible to connect something like that to my phone? From the website it says "Power: USB Class 1 (no drivers required for Windows, Mac, or Linux)" does that mean android might work with the right drivers? I have just found advice saying that the phone would not be capable of powering the DAC/AMP but that by using this device https://www.amazon.com/AmazonBasics-Port-2-5A-power-adapter/dp/B00DQFGH80/ref=sr_1_fkmr3_2?ie=UTF8&qid=1506292264&sr=8-2-fkmr3&keywords=Usb+hub+amazon+essentials and connecting it to the mains via a USB power adaptor, it would be able to power the device. Is it possible to know if it would be supported on Android?

I'm using the expensive DCDC0USB.

What problems do you have with the tablet loosing power while cranking?

Before having my DCDC-USB, I had this hooked up to constant 12v . When it would receive power it power cycleon, then off & then back on again. It seemed to help with my SSD drive detecting and power while craniking etc. http://www.amazon.com/dp/B00DQFGH80/ref=sr_rp_1?m=ATVPDKIKX0DER&ie=UTF8&qid=1456431334&sr=sr-1&keywords=amazon+basics+3+hub

Drove around with just the joycon and things were fine.

New hub arrived. Spent a little extra to get something I hope will be more reliable. Went with this one: http://www.amazon.com/gp/product/B00DQFGH80?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00

I know usb 3.0 is overkill but it's designed to handle over 500ma per port. Preliminary results seem positive. I'll continue to report back

Magnetic Data Cable (I had to solder two pins on the micro-usb tip together to turn it into an OTG adapter)

USB Hub (just what i had laying around)