After using Tidal and a hotspot for almost a year now, I finally figured out how to turn the hotspot on while driving easily. 1) Turn on the hotspot on your phone (iPhone settings at the bottom of the first grouping). 2) On the console, hit the car button, then the wifi/lte icon on the top right. 3) Wifi Settings 4)Turn on wifi. It should connect to the hotspot automatically from there since it will be the only wifi once on the road. Why the wifi icon disappears from your screen I still don't know, but even when I was trying to set something up it has disappeared and I have to go back to the car menu to bring it back. I haven't tried a voice command, I wonder if that'll work too. I'm going to give that a try. Nope, didn't work with voice.
I tried the native free Slacker and it was horrible. Maybe 320kbs will sound better, but I'm happy with Tidal.