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I don't know the answer to those questions either as I have a desk mounted arm which clamps to the back edge of my desk. Easier for me than drilling holes in the wall.
This is what I have: https://amzn.eu/d/3oAQOum
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Yeah I have one of these (actually this one https://amzn.eu/d/4w18PrK)).
The trouble is that there is only one screen and the desk is too small. What I'd actually like is something that just fits on the pole bit.
Can you get wall mounted ones with a bit of adjustment?
Also how do you get it off the wall once you put it on?