This article provides what kind of mounting is on the Elo 2201L monitor

Rear VESA Mount on Elo 2201L monitor:

A four-hole 100x100mm mounting pattern for M4 screws (7mm x4) is provided on the rear of the monitor. Remove the stand using a Phillips screwdriver to access this mounting interface. The VESA FDMI-compliant mounting is coded: VESA MIS-D, 100, C

For use only with UL Listed Wall Mount Bracket or equivalent.