re: ? about buying a TV

THIS is an articulating wall mount. Imagine the part on the left installed inside the recessed wall area and the monitor on the right can be moved forwards or backwards, left or right. Depending on various factors you can use this.

If the recessed cavity is too deep, you make certain all the cables are long enough to move out as far as you need and go ahead and connect them. Also, many integrators will install a solid sheet of plywood in the cabinet (either stained to match or painted flat black) to shorten the recess, but include a trap door for access to the patch panel on the back wall.