Sanus makes a soundbar mount (VMA202) for the swivel TV mount I have. To me, it seems like it will work and sound fine with the SuperCinema and look sleek to have it move as one with the TV. Any downside you can think for this? Thanks for your help!

Yes, that's a great setup and works fine. Make sure to position the setup such that the soundbar is at, or pointed at, seated ear level.

There are also soundbar mounts available that position the soundbar on top of the TV using a couple boomerang-shaped metal brackets with mounting slots for the VESA holes on the TV and the threaded inserts in the back of the soundbar. These can be used in conjunction with any wall mount or when the TV is table top (table top installations need a safety strap).