Slider,
First i would find the main cable feed that is in the roof. To find this, pop out the speaker in the bedroom closest to the door side. You may have to poke around to find this. Once you have found it, drill up through the roof to run you main cable feed. The system should be mounted where anywhere on the roof. My production manager recommends attaching the feet with sikaflex and the srewing down the feet.
I hope this helps.