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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
You should be able to match the base size but the best option is using the Vesa mount and taking the stand off if possible. Mount it to the wall and get a load of desk space back.