Room Treatment for a

I'm moving to a new house where the dedicated listening room is a FROG. That stands for Family Room Above Garage. As is typical for these room in NC they have a rectangular floor but the long walls are angled about thirty degrees towards the center starting about three feet about the floor. This makes the ceiling area smaller than the floor (imagine a stick figure house drawing with the top triangle truncated into a trapezoid). I plan to have the speakers against one of the two short walls of the rectangle floor. Does anyone have any experience with applying sound treatment in such a room? Any advice would be appreciated.