Not sure if this helps but in order to use Appradio, dont you also need to install the Appradio app on your phone aswell?
Technically no. All Appradio apps run appradio mode independent from each other. So for example if the only appradio app you had any interest in was Waze, you could download waze and nothing else, and every time you open the Waze app it will display in appradio mode on the display, while nothing else will unless you are mirroring the display.
Now if you want to go in with Appradio, the Appradio app is your center hub that the phone will go back to when you press the home button on the head unit.
Personally I find Carplay to be what Appradio wishes it could have been.