Note in the gallery the grand AV demo room with x2 7200s and a 7200HC below a flat screen and therefore with the treble height below the L and R speakers.
I actually like the demo room (for once) - it's got a 2.35:1 aspect screen, the kit looks great and, in silver, your attention is really drawn to it (which is precisely the idea in a demo room). Obviously, in a home cave, black speakers would be better.
At HH2, Bob and Rhonda weren't concerned about the centre speaker tweeter alignment (for Trifield at least).