A:AnswerYou can certainly stop in at any Best Buy location near you to find out which one would be best suited for your application and then get a price for install
A:AnswerIt does both. The swivel connected to the wall allows for left and right swinging motion. The part directly attached to the television allows for upward and downward adjustments.
A:Answeryou would need to uninstall it, and reinstall it, using a level/marks, etc to ensure all sides are equal & TV is not leaning one side to the next.