Has anyone ever used subs in the top right and left corners of the ceiling? I am designing a new listening/HT room with more being dedicated to listining. but if it sounds good for two channel than it should be ok for theater as well.

Anyways I would like to put subs in the top corners left and right so that they are close to the same plane as the mains and to stay away from my tv. I would use 2 2242's for this application. (wonderful woofer) If you have not guessed I do love bass, but sometimes I do turn them off to just enjoy my 250's. my goal is to have as much bass or as little as I deam nessesary.
Can anyone help
Thanks Shane