Decisions, decisions. The best laid plans... I agree with most that 9' may be a bit too far away. May I suggest: Come up with a plan (revised), re-work it, instill it, then tweak it. Your third post may be the answer. Position your rears 3' behind (on stands?) for ht, and at all all other times, simply have them set aside. Welcome to the world of let's get it all (ht and listening room) into an everyday space. But then, much of the fun of it is the tweaking. Welcome to AH ArchieH.