I have some CD flares on the horn section of PI 7's and have a long room. I point the horns right at me to get a better sound stage. The bass doesn't seem to suffer for the move off of 45 degrees, but the sound stage is great. You don't have to use them tight to the corners to get that incredible bass either.If you hear the corner horns you'll be VERY impressed. They do take space though.
Grant.