Hello Number409,
On our 2021 Mallard M260 we carefully removed the cable TV outlet/amplifier and used a flashlight, mirror, and tape measure to locate the backing plywood. After that it was easy to screw the TV mount to the backing plywood. We used this: PERLESMITH UL Listed Lockable RV TV Mount for Most 13-42 Inch TVs, RV TV Wall Mount for Camper Trailer Motorhome Boat Truck for a 32-inch flat panel Roku TV. We used the pre-installed Winegard AIR 360+ V2 antenna. We added a WiFi Ranger Osprey Category 12 with an AT&T 100 GB $55/month data plan. Both the Winegard and Osprey have served us well in our travels.