The ornamental design for a mountinghole in appliancewall, as shown and described.
FIG. 1 is a top perspective view of a mounting hole in appliance wall showing my new design;
FIG. 2 is bottom perspective view thereof;
FIG. 3 is a top perspective view thereof; and,
FIG. 4 is a top plan view thereof, the bottom plan view being a mirror image of the top plan.
The broken lines immediately adjacent to the solid lines represent the bounds of the claimed and all dash dot dot lines are for illustrative purposes only. None of the broken lines forms a part of the claimed design.