The ornamental design for microwave hover cover, as shown and described.
FIG. 1 is a perspective view of a microwave hover cover showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a back view thereof;
FIG. 4 is a left view thereof;
FIG. 5 is a right view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken lines associated with the fish on microwave hover cover shown in FIGS. 1, 2, and 6 and the broken lines associated with the handles of microwave hover cover shown in FIGS. 1-6 show portions of the microwave hover cover and form no part of the claimed design.