I have a 2015 Prism that has a TV in the BR. That makes 3! (Salon, outside, and BR) all in a 24 footer. We only have 1 TV at home.
Anyway, we never use the BR TV. It is attached with a bracket that sounds like the same one mentioned. There is a lever at the bottom of the bracket, which must be pushed to the side (as I remember, to the left when facing the TV.) Then the bracket slide and the attached TV can be removed for access, by sliding the TV up (it was a little hard at first).
I disconnected the TV from the bracket slide (4 little bolts) and used the bracket to mount a fan (120 volts). There is a 110 volt outlet there (for the TV) and I installed a 12 volt plug wired to the nearby fuse panel to use with a 12 volt to 120 volt inverter when 120 volts aren't available. I'd rather have the fresh air than realty shows.