I think the contractor John link is bunk. Seems convoluted and didn't make sense to me. I'm toopid?
Mine,IIRC is at 40" at center and is perfect for L/R off screen pans since the tweeters are exactly the same height. Ideally I think you'll want your center and L/R tweeters within 12"(height wise). Mine are like 18" but at 14' distance the front end is seamless, so putting that center directly on the tv stand won't give you any problems. Agree with hetfield(be cool if it was James!), that's the way to go. Actually, it would be better to install a fireplace to mount the tv over. It's all the rage these days. Totally sweet.