I hope the pics come thru. I removed the inside panel of the closet and used construction adhesive to secure a piece of 3/4 " plywood. It was about 2 feet by 2 feet in size, in order to provide a solid surface for the mount.
Re apply all of the trim that was removed and you have a sturdy surface to screw the mounting bracket lag bolts into.
Having the TV on the swivel mount is very nice and it tucks out of the way when not needed. I also use a small bungee to secure it during travel so it is not swinging all over the place.
I got my mount on eBay for 25 dollars. Much cheaper than in local stores. Best Buy had the same one for around 50.