So I am ready to mount the rear speakers but thought I should get some advice before I do. My sofa is up against a back wall that on one side opens to the kitchen and the other to a hallway leading to the garage. My question is should I mount them on the sides at a 90 degree like I believe is my only choice or could I get away with mounting them over our heads? Also on as far as the opening to the kitchen and garage I could fire them into the side walls if that would be better but not sure what to do. I thought having them on the ceiling as well what is everyone's opinion?