Yes, dedicated AV rooms are a good family get away. My wife says it is her favorite room in the house.
As for all of us, unless you have an acoustically transparent projector screen, center channel placement is a problem without an ideal solution. The old over/under conundrum.
How high is your center tweeter above the tweeters in your mains? Mine is 2 ft, and I just about get away it.
The under over was a big dilemma for me. However I decided that coverage of the whole room would be better over, especially the rear seats, even though it spaced the tweeters further. I think that was the correct solution, but I guess I will never be certain.