A) Those are all representative of broadband traps. GOOD.
B) That's a very typical starting point for just about any room.
C) I'd still go floor-to-ceiling in the corners for sure - and hopefully stagger maybe 5 (3 front, two rear perhaps, maybe the other way around depending on the room) on the short walls. A larger "cloud" could be in the cards also.
A lot rides on the room itself - Controlling the lows is paramount and the more broadband trapping, the better (unlike foam, where even a little too much or a few misplaced sheets can throw a room into audio chaos). I'm a fan of live floors with rugs over wall-to-wall as well...