The ornamental design for a monitorwall mount apparatus, as shown and described.
FIG. 1 is a perspective view of a monitor wall mount apparatus showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines in the drawings depict portions of the monitor wall mount apparatus that form no part of the claimed design. The wire frame lines shown throughout the views indicate surface contour.