Richard,
Height was more of an issue with the older RL-1-2's, which had more to do with the bass response. But if the main driver is to high, the lower mids seem to suffer. The front driver on the RL-3's solved there height issue. The new plinth bases don't really care if they are on wood, concrete or carpet. Set up with the EER's is for dummies, the round RL-1 - 2's it was hard to tell if the tow in was just right, the EER's being square make that a bit easier, and like most speakers, there position relative to room boundaries will change the bass response, other than that, almost anything else works. They can almost touch each other, 5 feet in front of you and the EER's will image just as well as the normal speaker set up.
I have, on more than one occasion, while the listener sat in the listening chair with eyes closed, set up two radials just in front of, and right beside the listening chair. Then turned on the music, had them open there eyes only to tell me the two speakers, in the normal speaker position was what he was listening to. Even after knowing which pair of speakers were playing, they still had the sound stage up in the front of the room.
I don't think the EER's are going to let you know what kind of mouth wash Peter Gabriel used, I think the only way to tell that would be if the EER's produced sent, they're good, but not that good!!!
BobZ