Definitely mount your TV to an articulated arm so the angle can be adjusted for your seating or laying positions. As Jim pointed out, mounting the TV near the cabover will limit you watching from only half of your booth dinette. If you have couch arrangement, you have more space.
I used a 22" TV/DVD combo in my Arctic Fox and could have fit a 27" in the available space. I mounted a swing arm on a left side cabover closet wall and stored the TV against the left bedside window/wall. This is where AF would have mounted their TV, but would have not folded it the wall for transport. I used a longer arm mount and larger TV, so I also ran larger and more lag screws through the stock AF backing board. I used an AC powered TV though a 300w inverter rather than DC and also used the power to charge laptops and other devices.