Thanks! Yes, they were designed to be hung on walls and have thin profile (This was my primary requirement). The fronts/rears are sealed speakers with no ports. The center speaker has ports at the back but they provided pluggable foam for them to seal them as per preference (I have kept them open and also raised the Center speaker a bit at bottom from wall to allow ports to breath).
Requirement for wall treatment would be subjective I guess. I hope Denon's Audyssey is already taking care of that in it's room correction.
Here is how speakers look hung. I have kept the front's tweeters at ear level. For rears, no option but to keep at slight height. All sounds good and balanced though-
I have kept the grills on. Reduces the looks but eliminates risks of someone accidentally bumping something into speaker dome/tweeter.
