I have just come to this thread.
Sorry, I would expect those to suck big time. I would not muck up my dry wall for those.
There is no enclosed baffle. So they are glorified ceiling speakers for in wall. The 2 X 4 space will vary from installation, and all the speakers share the same cavity.
There is no back box like a quality in wall would have.
There is nothing inherently wrong with an in wall speaker, as long a it is properly designed. Of course it needs voicing for that application.
I have built and designed in walls. In fact an in wall is an excellent excuse to design a TL. The wall space between studs is just perfectly suited to a very good in wall installation.
My center speaker is a TL through wall.
The rear of multiple drivers firing into the space between studs will not deliver high fidelity reproduction.
Think long and hard before you cut into dry wall for speakers designed like that.