Canes, it's real tough to predict how they will sound 15-20 degrees behind vs face on or forward of MLP. My experience says ears-brains are not as sensitive to sounds from behind. I'm not so sure I trust my experience in this regard with sides though because there are a few factors at least. I know position experimentation with on-walls isn't fun but it may provide you with future comfort. You strike me as the type who will always wonder if it could be better.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated