Neb,
Nickbuol, another Axiom member I believe has his center mounted above his Carada screen. Personally, I prefer to have the 150 mounted below the screen between the two mains. Actually my center is slightly set back from my mains to create a slight curve, and improve the sound stage. If you notice the centers have a curved top if you look at the pictures. You can flip the 150 over, just make sure you flip the grill over also so the words AXIOM are right side up. This will help direct the sound up, if your going to have stadium seating.
Randy
60's 150 350 4-qs8's
denon 2805
sanyo z2 projector
samsung hd tuner
toshiba dvd
