with Alpine GPS and analog cell phone.
That setup worked fine for me even though it was an analog phone. It very much depends on who is your service provider. Verizon has the best
coverage of all providers.
The GPS was added externally on the side as shown in the first pic. It worked fine in that position. As you can see, it is angled toward me so it was easy to see.
You can add an Alpine in-dash monitor but you have to 'gut' the Mercedes radio, CD player and end up with a complete Alpine replacements. For me, that was too severe!
This may give you some ideas.