Simple molly bolts thru the drywall ceiling, small link chain, and screw eyes into the tops of the speakers..
The screw eyes go in slightly to the rear, so when lifted, the speaker hangs forward.. You can then attach a line from the back of the speaker to the rear wall to pull it back to get the angle you want..
Result: No floor to color the sound, and non-parallel walls to the speakers standing wave.. (I sound so high tech! haa)

LFE ! The rest is just details..