I definitely recommend Fully Kiosk Browser, it’s easily worth the 10$ license even if you don’t need the features. The integration into Home Assistant is great, you can do all kinds of things really easily to the app through HA like loading URLs and controlling the screen on and off, the integration is really superb.
ETA: I forgot, it also has a webui to manage it remotely. Also, I’m pretty sure it’s free still, I just mean it’s that good of an app that it’s worth whatever their license costs (I bought it a while ago).