Read the manual. Company provides specific recommendations for both.
From my experience, the manual is the place to start with, not to end with.
It's a guideline that moving things around a bit (closer or away from walls), provides different sound, many times better.
To move a speaker a little here or there is the cheapest upgrade to sound you may found. I know another one, but it's not for this tread.
Or maybe it is?
It's practically free and has a lot to improve.
Still the question remains: did you ever try to fix a loudspeaker measurement or a listening audition, and B4 doing EQ,
trying to fiddle a bit with the placement?