Brad, the best way I have found is to make some nice brackets that hang down from the ceiling, I just made a pair for my sister’s house as she has a similar problem to yours for the rear speakers. I made them out of Aluminum, they allow the speakers to hung from the ceiling and you can adjust the horizontal and vertical axis for the desired positioning.. If you are interested in this idea you can e-mail me I will e-mail back to the sketch for the design, they look nice and work very well.