I just got a dual mount from Huanou and I love it. Supports heavier monitors and has super long arms. I'd get the single arm in a heartbeat.
I’m using a dual monitor arm and it’s this off Amazon.
https://www.amazon.com/Dual-Monitor-Mount-Stand-Adjustable/dp/B07X262MRK
I just transitioned my dual monitors to a dual monitor arm (monitor arm and make sure you check the clearance underneath the desk so that the location you want to install the arm at will be properly secured. I ran into this issue and I can only secure it in one spot on my desk because the desk leg frame underneath gets in the way. Huanuo seems pretty solid for monitor arms, I’m not sure if you need a dual monitor arm or single. Plus their products are less than $100 and good quality.
I made a bread board table top out of 2x6s and used this:
Along with
It’s a smidge wobbly at its highest setting but it’s really up there. I’m 6’1 and I wouldn’t be able to comfortably stand and use the desk at that height. I also think the monitor arms connected at the back and hovering cause the smidge of wobble but nothing that I’m concerned for. Also, it’s on carpet. Otherwise at a normal setting and lower it’s pretty sturdy and gets the job done for a good price. I’ve taken the top off and disassembled the legs and put everything together at the new place. No issues so far going on 3 years.