need a speaker mount for rear center
 

Anybody have any recommendations, suggestions? How hard are these to install? Thanks.

Depends. If your speaker has a rear keyhole and you're mounting it to a rear wall, a simple single screw in a wall anchor will do fine. Otherwise, BB and other stores sell many wall mounts. One type has a universal swivel joint and runs about $15-20. You screw it to the wall (usually 2 screws & anchors) and then attach it to the rear of the speaker. Pretty easy. What are you expecting to be difficult?

Drilling the screws into the ceiling since I don't have any power tools. Thanks for your response.

Use good anchors (those plastic things) and the swivel brackets I mentioned should work fine for ceiling mounts.