Mounting TV on Faux Veneer
Bad idea overall to mount a TV up high over a fireplace. Just do a search here and you will find many answers discouraging this for a multitude of reasons. Key among the reasons is based upon the fact the best viewing of a TV is pretty much straight onto its screen. In addition, for your physical health the best viewing position is sitting and looking straight ahead rather than trying to stare up at an angle.
I have heard folks say that they have regretted ever having hung a TV up over a fireplace. Do yourself a favor and get a TV console with an inbuilt mount post at the back to which you can attach your tilt TV bracket. Enjoy the convenience of being able to move the whole thing around when a decision is made to reorganize the room layout, change furniture or you are sick of the TV location. You will also be glad you did not do a big disfigurement of the faux veneer around your fireplace unit.