Which way are you planning to orient the perches? Parallel to the 11ft side or perpendicular to the long wall?
The main issue you will face with perch placement is in providing adequate dismount "running" room. Chickens don't just hop straight down from a perch. They hit the ground but do not "stick" the dismount as gymnasts try to do, but they "run". If you run a long perch the 11 ft length of the coop, there is no way your chickens will have enough dismount room without smashing into the opposite wall, risking injury.
I suggest you run short perches oriented parallel to the short wall. Perches at different heights will accommodate different breeds. Heavy breeds shouldn't have perches higher than 10 inches. The highest perch should be no more than 30 inches high. Foot and leg injuries are much more likely with higher perches.