The NFL app quits every 20 minutes on Apple TV. My support ticket got a canned response to reboot, reinstall, and my follow ups have been completely ignored. The app has a 1.5 star rating. Run away if you plan to use this on Apple TV.
https://www.reddit.com/r/cordcutters/comments/16n00e7/how_exactly_does_nfl_premium_work/