If you want something that is more of a static kiosk setup, there is a different Balena supported project that supports more of this style use case. Without the need of casting or connecting with Airplay
I'll never touch Balena anything since they put phone-home in Etcher (a simple tool for writing a local file to a local
flash blockdev, essentially just a GUI front end to dd). I can't spend the time to audit their software for spying, and they already burned up whatever default level of trustworthiness they had.
https://github.com/balenalabs/balena-dash