I have a 2015 SSV or XL Fleet as well, I was interested in the Phoenix Automotive Tesla style radios but it is unlikely these would work easily without upgrading some other components. This was their reply to the picture of the center console sent in.
“Hi,
Thanks for your inquiry.
We checked your sent dashboard picture. Sorry, the 12.1'' unit is not compatible with your vehicle.
Also checked other radio unit, it's not workable. Sorry, no proper unit would be recommended to you.
Thank you.”
Probably a double din Kenwood or pioneer with Apple Play is the way I will go.
Has anyone else with this model changed out the base radio, if so do you happen to have pictures of the wiring behind it?