Looking for suggestions for a wall mounted shelf to hold a projector.

I need to place it above an arched doorway. The projector is about 12 lbs, and its dimensions are 5" high, 12.25" wide, and almost 16" deep (before cables, so need to add a little extra).

I'm not the handiest guy in the world so would prefer something that is fairly easy to mount, maybe even something that is self-leveling. I'm flexible on looks/style, and willing to spend a couple of hundred $ if it's really the right solution.

Thanks!
Rich