The ornamental design for an electronicdevicemountingplate, as shown and described.
FIG. 1 is a perspective view of an electronic device mounting plate, showing my new design, deployed in a typical usage environment;
FIG. 2 is an upper view thereof, showing the electronic device mounting plate only;
FIG. 3 is a lower view thereof;
FIG. 4 is a back view thereof;
FIG. 5 is a front thereof;
FIG. 6 is a side view thereof; and,
FIG. 7 is an opposite side view thereof.
The broken lines in FIG. 1 show unclaimed environmental detail and in FIG. 3 show unclaimed subject matter only and form no part of the claimed design.