I got my Gemini yesterday and mounted it today. The mount I used is an "Arkon Heavy Duty Tablet Wall Mount". Now, I have a Proclip mount in my car that this attaches to. Without that, you'll want a suction cup version, or just simply drill into an appropriate part on your dash. They also sell the holder separately so that you can attach it to any 2-prong t adapter.
I used to put a tablet in the car when supporting events for APRS use. But this is a perfect use for the Gemini, and it's a much more capable device than any prior tablet I've owned.
I haven't ran the cables through the trim completely yet, but the 90 degree usb-c cable I picked up just manages to fit perfectly around the vertical support arm. The cable itself actually snugs into a track in the mount itself, securing it in place for when the Gemini is removed. The gemini makes my 4th USB device for in my car. I have a regular android smartphone, a dashcam, a unifi hotspot (that white cable behind the gemini leads to it - will replace that with black as well), and now the gemini. I also have my amateur radio connected as well.
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Full Mount:
http://a.co/cJNfARzSeat Belt bolt variant:
http://a.co/iIBKCE8 Standalone holder:
http://a.co/02skGCQ Cables:
http://a.co/0Ys6hhu