The T brackets are for flush mounting on a wall. The Q's just sit on this bracket and their weight help them stay in place. You would not want to use these for ceilings, not sure how you could anyway and have the speaker orientated correctly.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85