Still a work in progress as I need a new cabinet but should give you an idea.
It's on the B&O motorised bracket and has been built out from the wall slightly so the front of the TV is level with the outside of the alcove, also allows more turn into the room with the 7-2 speaker.
Also for info, it's on a stud wall. The wooden block used to give a bit more distance from the wall is attached to the vertical stud and also using some heavy duty plasterboard anchors. The bracket is then attached to the block and through to the stud using long screws, and through the block to some more heavy duty plasterboard anchors. I could swing off it if I wanted, so with the right fixings and a bit of thought any wall will take the weight.