If the Apple TV is going to sleep while you're listening to Triode, you'll probably want to disable the screen saver (which, in turn, disables sleep.)
 

There is a system preference to prevent sleep in Apple Music & Podcasts, but it's not available to other apps.
 

Instead, we have a setting in the app to disable the screen saver. From the now playing screen, swipe up to get the info bar, then tap on the gear icon to get to settings. Select Screen Saver: Disabled and screen will stay on until you leave the app or the stream stops.