To install Stremio on Google TV, you'll need to sideload the app, as it's not available in the official Google TV store. Don't worry, it's easy! Just download the APK file from the official Stremio website, and then use a file explorer or USB drive to transfer it to your Google TV device.
Once you've got the APK file on your device, simply install it and launch the app. You'll be prompted to sign in or create a Stremio account, which will sync your watch history and favorites across all your devices. Easy peasy!