UX design is a complicated matter, and you may wish to see what others consider when building apps. The following are links to some of the major OTT players' advice on design guidelines and best practices.
- Android TV: Design for Android TV
- Apple: Optimizing Your Product Page
- Apple: Human Interface Guidelines
- Apple: Show More with App Previews
- Fire TV: Design and User Experience Guidelines
- Roku: Design Best Practices