A:AnswerIt absolutely can be ceiling mounted. You just need a ceiling mount kit that will support the weight. And of course a ceiling that will support the weight. Not just drywall. Needs to be mounted into ceiling studs or concrete.
A:AnswerI'd go into it with the assumption that it couldn't, I remember there was always issues with smart TV's not having HBO GO. Now they are starting to have that app, or at least available. So basically there is many video apps that you may not be able to use.
But there is always a way, I'd talk to an associate that's knowledgeable and find out what "add on" you may need. I'm thinking that a google Chromecast.... definitely an apple TV, possibly a ROKU, would all be possible solutions to give you any missing video apps