Within your Maestro hub, you have two options available when you are offline - TV mode and Grid Mode.
TV Mode is best used when you have VoD content you'd like to loop at all times. For example, if you want to repeat the last live stream for viewers to see if they missed it- TV Mode would be the best option.
Grid Mode is great if you have content you'd like users to discover. If you have playlists from YouTube, Twitch or Facebook you can put them together on your Maestro hub for users to browse in one place.