Trying to cut the cord for aunt & uncle. They're older so I want to create a minimal home screen with just 1 or 2 apps. I currently have the device set to App-only mode but there are still ads that display on the home screen. Since there's no way of getting rid of those ads, they could possibly click on them which takes them to the corresponding streaming app install page.

I know they wouldn't be able to do much else if they were to accidentally install an app such as Disney+ or HBO Max since they would need an account to access them after installation; however, I'd like to either disable or password/PIN protect app installation just to close off the environment so to speak.

Does anyone know if disabling or password protecting app installations are possible?