I've just installed a couple of TV outlets on architraves in my house. All the ones I could get from Bunnings appear to be designed for side entry of the coax, there's a clamp that holds the screen on the side of a small PCB that's secured to the plastic with a few bolted pillars. That's not a good setup when the thing is to be backed up by a brick wall with a hole through into the cavity, due to the stiffness of good quality TV coax nowadays. In fact any sort of wall thicker than about 6mm is going to have the same problem.
It does occur to me, what sort of wall structure are these actually designed for, or is it just a case of dumb design?