The Audio Physics will not have quite the same kind of imaging close to the wall as it is capable of in a more free standing location, but, that would be the case with ANY speaker that must be located nearer to a back and/or side wall. Because the Avanti's are NOT excessively heavy in bass response, I would bet that you can make it work so give it a try.
For speakers designed for relatively close to the wall location, you should look at the Gradient Revolution. It is extremely flexible, in terms of placement, and sounds quite good. Another possible candidate would be an Audionote speaker--these are all specifically designed for near corner locations.
I don't know about the specific MBL model you are looking at, but, the speakers I've heard from that line all seem to be quite touchy about location and all sounded best quite a bit away from all walls. That might be tough to work with.
The Rockport Mira and Wilson Sofia are not that much different from your Avanti's in terms of position requirement--all sound best away from walls, particularly the back wall, but they are nice sounding speakers so they might be worth investigating anyway.
For speakers designed for relatively close to the wall location, you should look at the Gradient Revolution. It is extremely flexible, in terms of placement, and sounds quite good. Another possible candidate would be an Audionote speaker--these are all specifically designed for near corner locations.
I don't know about the specific MBL model you are looking at, but, the speakers I've heard from that line all seem to be quite touchy about location and all sounded best quite a bit away from all walls. That might be tough to work with.
The Rockport Mira and Wilson Sofia are not that much different from your Avanti's in terms of position requirement--all sound best away from walls, particularly the back wall, but they are nice sounding speakers so they might be worth investigating anyway.