Nexus 4 sized holder with integrated quick release base.
Phone slides in from side - it's a good firm grip.
The version I printed was overkill, but works. I would recommend trying one of the half-sized ones, which will leave your side buttons totally accessible.
Choose a version with your correct base plate orientation. (I didn't! That's why my tilt handle is off to the side in the photo.)
I paramaterized the dimensions of the base plate, so hopefully you can adapt this to different sized bases with the same basic design.