Actually, it is best to have a slight arc, from the left-center-right speaker, gives you a much better sounds stage. The center channel should be slightly back from the mains.

_-_

Alan has mentioned this often.

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