This article provides what kind of mounting is on the Elo 2002L monitor

Rear VESA Mount on the Elo ET2002L:

2002L touchmonitors, a four-hole 75x75mm and 100x100mm mounting pattern for M4 screws is provided on the rear of the monitor. Remove the stand using a Phillips screwdriver to access this mounting interface. The VESA FDMI-compliant counting is coded: VESA MIS-B, 75, C and VESA MIS-B, 100, C.