I was part of the Nobu Malibu project where we used a lift in the bar that tucks the TV up parallel to the ceiling. It's a 50 or so.
This lift is about eight feet inside the building. Outside there's six foot deck to where you look down on the sand and the waves. THAT's how close this is to salt water. It's been in for three years and it works fine. It's stainless, though....
A good answer is easier with a clear question giving the make and model of everything. "The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw