I wouldn't worry about the space, you make do with what you have and The benefit of the floorstander over a smaller speaker is worth the minor reflections you may have off the wall. I have an M80 closer than that to a sidewall and they sound great.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70