Acer 31.5" ED320Q Xbmiipx 240 Hz Curved Gaming Monitor - Manual (Page 12)

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ATTACHING/REMOVING THE BASE
Note: Remove the monitor and monitor base from its packaging.
Carefully place the monitor face-down on a stable surface -- use a
cloth to avoid scratching the screen.
1. Attach the monitor stand arm to
the base.
2. Secure the base to the arm of the
monitor stand base.
Note: If installing with a wall mounting kit, it is recommended to use
VESA mounting kit (100 x 100mm) with M4 x 16 (L) mm screws to fix
your monitor on the wall.