This article provides what kind of mounting is on the Elo 2202L monitor

Rear VESA Mount on the Elo ET2202L:

A four-hole 100 x 100 mm mounting interface for M4 screws is provided on the rear of the monitor. Remove the stand using a Phillips screwdriver to access the mounting interface. The VESA FDMI-compliant counting is coded VESA MIS-B, 75, C and VESA MIS-D, 100, C.