A lot depends on if your doing a 16:9 or 2.35 screen. I have 9ft ceilings. My screen is 10ft wide and 2.35 ratio. Rear seating line of site is about 1/3 from bottom, front row is near the bottom. I think personally center would be to high up from what I've read. I will take a picture a post later.
Anthem AVM60 Outlaw 7700 Emotiva A500 Epson 5040UB