Installed a touch screen so I can run Car Play like a modern car. It has an option to connect using FM radio and that's what turned out to work best. Much better sound! For the first time I heard and felt sound from the subwoofers. Navigation and music are just a touch away now. I used the window mount to locate the 9 inch screen directly over the center vents. My view is unobstructed and since I use Car Play is our Malibu I can operate the system with a minimum of distraction.
Found it on Amazon, link is below.