I use the RAM claw and ball system for just about everything. Lots of options to create your own (clamp sizes, suction cups, arm lengths, etc). You could start with
https://www.amazon.com/RAM-MOUNTS-RAP-B-400-201U-Diameter-Tough-Claw/dp/B00Q016EOE
and
https://www.amazon.com/Action-Mount-Camera-Adapter-Mounts/dp/B011SM5UIU/