Yeah but think about this. What if the missus is off-centre when she's listening to the M5s? And she curses you because the dialog isn't in the centre and sounds weird? Then she's gonna come down hard on your ass, yeah? So I guess one tactic may be to give her the good spot right between the M5s so she don't complain.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated