I am having the same problem, I emailed AOC and if I receive a reply will post it here. Hopefully you will do the same In the meantime I am going to mount it as is.
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base removal
I successfully removed the base. There are 4 screws to remove. 2 are very close to the piece that you want to remove. The other 2 are higher up but if you go straight up from the lower 2 you can determine that they line up with the metal bracket. Once all four are removed the base slides right out. Hope this helps.