The tweeters don't have to be at ear level; they can be angled downward so that they are pointing at ear level. I helped a friend install his home theatre and we hung a pair of Linn Tukan bookshelf moniters and a Linn Centrik from the ceiling using mounts from Good Guys. The Tukans are rear ported and sound great on the ceiling; just enough additional bass from the ceiling to give them a little more weight.
Just make sure the mounts you use are more than adequate for the speaker; ie, don't use one rated for 30 lb max for a 30lb speaker. Get a larger mount in that case; overkill it.
Just make sure the mounts you use are more than adequate for the speaker; ie, don't use one rated for 30 lb max for a 30lb speaker. Get a larger mount in that case; overkill it.