The new Axiom ceiling bracket is designed to let a user adjust the angle if they would like. In my case I have mine about 7ft off the floor with no angle and they are great, however, my room is very big and they are spread out. I would think in some cases a little angle would not hurt.

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