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Hello Jen, Yes you got it right. Hanging a mount in a corner essentially means hanging the wall plate on one of the walls and with a full motion you'll be able to extend and swivel within the corner. For any more recommendations for full motion mounts, feel free to check out this mountfinder tool on the website: http://mf1.bestbuy.selectionassistant.com/. Or, just call us at 800-359-5520. We are here 7 days a week to make sure you get what you need. Kathryn @SANUS
Technically, I think you could use this mount for your set up, but I'm not sure I would recommend it because given the size of your unit, I think it will be a pain to get set up just right unless you have plenty of room to get in behind it. A lot has to do with the how the brace for your TV would fit the mount. Our 75 was just impossible to get positioned just right on this mount.