It can be inserted by disconnecting both cables on the back and then slide it in from the front of the console. Clean all the sticky foam residue or it won't fit in. Press gently, you should hear a click noise, then reconnect both aux and USB cables back in.
I also tried to remove the metal block form the roof and broke an Allen key too, so I assume those screws have threadlocker applied to it. I'm going to adventure in unknown territory and remove the roof trim, hopefully over the weekend.
Thanks to all the useful information posted on this thread!!!
I just bought one of those former limo/taxi 2016 Kia Soul with 134,000 km. I got mine from https://www.langmotorcar.com
In my first run from full charge (guess-o-meter showed 125km) to empty I got 148 km in a variety driving...