i've done this a few times and never had a call back for any reason so i can only assume everythings fine.however i once was asked to install a 50" plasma in a recess, i pointed out that with such limited air flow restriction around, the tv was liable to overheat....
he insisted and my invoice noted my disclaimer as to future overheating problems, got asked back a week later to see the tv was not only inside a recess but had been boxed in and plastered around!...it had burned out.....tv2 option was to install 3 computer style fans in boxing behind(not done by me!) for cooling......unsuccessful....tv3 option was to move the tv to another wall....made me laugh anyway.....