Our listening room is also our living room (13'Wx17'Lx9.5H ave vaulted ceiling).
I have found the best sound with about
7' speaker separation, 18" from back of speaker to the back wall, and about
7-10 degrees of toe in, which is a function of where my listening chair is more than the ideal toe in for the room at large.
With this set-up I have no gaps in the "soundstage" and do not seem to miss anything that is otherwise presented in the music.
Of course, I'm so high on these speakers you could turn them sideways or backwards and I'd be happy with the sound! I'm not a good source for accurate information as I'm still in the honeymoon phase!

ScottyWatty