From a guy who mounts 100's of TVs a year. If I were to wall mount one I'd use a back plate. They sell them to mount on 12, and 16" stud centers. I usually try to hit Al least 2 vertical studs and use a snap toggle with ones I can't hit.
A good reference for mounts is www.mounts.com.
I can selling those at my cost for anyone interested.
I wouldn't use a Home Depot or lowes mount. Or even the the ones they sell at bestbuy. At least imho