I guess it depends on how you are going to mount them to the ceiling. I would say they are definately NO GOOD for wall mounting as they have a rear firing port. The E30's & 50's have a front fireing and the E10's have a sort of dual side firing.
Are you running them as mians or surrounds? What other speakers do you have out of curiosity? I have the E80's being delivered tomorrow.
I would be running them as mains and surrounds. I currently have no other speakers at this time. I recently moved into a house that was wired by the previous owner for surround sound.