I’d be interested in seeing FR graphs for the various wall mounted speakers especially the new on-wall since they deviate the most from the basic standalone design. Especially interesting would be to see a anechoic plot compared to a on-wall plot to compare.
My interest is more than academic as I’m looking to buy something to replace my M22s in the back so I can move them back up front as wides. An on wall M2 or M22 might fit the bill since the shelf I was planning to build to set a normal speaker on would be right up against the wall anyway.