Success with inwalls is nearly as much a function of how good a back box enclosure you can create as the speaker itself. Also because of the way inwalls acoustically load into a half space their LF lack the step response of a box speaker, so you may find EQ is necessary to get the sound quality you expect.
In Wall Speakers recommendations
I am under contract to buy a non custom new construction house. My current system (Sopra 2 fronts and B&W 805's rears) will not work in the room and will unfortunately be forced to use in wall and in ceiling speakers. I have never shopped them before. In my brief research, I have found that Focal and B&W both make well reviewed in walls, along with JBL's and Golden Ear. It will not be a dedicated music room and will not be sonically perfect. It has 10 foot ceilings, glass sliding doors on one side wall and open to the kitchen and dining area in the rear so no close rear wall. YUK, can anything work? Thanks for your help.