Configure any web page - a dashboard, sales kiosk, Dakboard, or MagicMirror - as the screen saver for your Android TV.
1) After install, go to 'Settings' -> 'Screen saver'
2) Select 'Dashboard Screen saver' to enable the app
3) Configure the URL to display as your screensaver
The URL to use is the screen's 'Private URL' found in dakboard screen preferences under the 'Settings & Defaults' tab.
Tested on Shield TV and MiBox