Wilson Alexia - speaker placement question

I'm looking at this speaker and am trying to figure out if I'll have poor bass/midrange as I can only keep the speakers 20-23 inches from the front wall.  My room is 16 w by 21 l with 9 ft ceilings.   This is a full range speaker and I'm concerned its bass capabilities may interact poorly with any room-related sound modes.  Appreciate any  comments/guidance.