Monitor Arm Base

FIG. 1 is a front perspective view of a monitor arm base showing my new design; FIG. 2 is a front view thereof; FIG. 3 is a rear view thereof; FIG. 4 is a right side view thereof; FIG. 5 is a left side view thereof; FIG. 6 is a top view thereof; FIG. 7 is a bottom view thereof; and, FIG. 8 is an environmental front perspective view of the monitor arm base of FIGS. 1 - 7 , shown with disclaimed monitor arms for illustrating an example environment. The broken lines depict portions of the monitor arm base that form no part of the claimed design.