I use two of these for my 34" Ultrawide and 27" in Portrait.
https://www.amazon.com/dp/B01MXEIA00/
Here is what my setup looks like with those two arms and monitors
They also have a dual monitor version.
https://www.amazon.com/dp/B01F2SIY02/
Friend of mine uses the dual version with a 32" and a 27 in portrait.
I use two of these for my monitors.
https://www.amazon.com/dp/B01MXEIA00/
There is also a dual version, but it's only available in silver at the moment.
https://www.amazon.com/dp/B01F2SIY02/
As for clearance, I have my desk about 4" away from the wall currently, however If I moved the monitor arms forward more, I would be able to push the desk all the way against the wall.
