In short the answer to both of your questions is NO....
Although their are many platforms that slingbox has been customized for, a straight TV app for internet connected TV's hasn't been one of them thus far. they have released no info on if and when they plan to do so----to head off your next question.
As far as using a slingbox simultaneously at 2 remote locations; they have specifically limited each slingbox to one stream at a time. You can have multiple slingbox's connected with each streaming to sa different remote user; however you must have suffiecient bandwidth and source devices to support that method.