Plug and play radios exist. If you are comfortable running wire, you should have no problem finding a creative place to hide the unit and run the wires accordingly.
Yes there is.
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You can download shows and listen to them offline with the app. Pick your favorite shows, download them at home, and then plug the unit (or bluetooth) in an listen for hours and hours -- no internet required.
Not true. You could easily run a factory SiriusXM setup if your aftermarket receiver was SiriusXM ready. I'm surprised its not since even the most simple aftermarket receivers are.