The ornamental design for a wall-mounted safe, as shown and described.
FIG. 1 is a perspective view of a wall-mounted safe, showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is an enlarged portion view labeled, ‘FIG. 8’ in FIG. 1.
The even broken lines in the figures illustrate portions of the wall-mounted safe that form no part of the claimed design. The dash dot dash lines in FIGS. 1 and 8 are for the purpose of depicting the boundary lines of the enlarged view and form no part of the claimed design.