I have kiosks, both Windows 10 and Android, that I only want a select few websites to be allowed as these will be outside of our content filter.  This can be done with with an App Configuration for managed apps but these are managed devices.

 

The kiosks themselves are configured and boot to the page I want.

Windows 10 is done via Windows 10 Kiosk Profile.

The android devices are enrolled with Android Enterprise.