This phone clip for a tripod includes a 41-mm quick-release shoe to insert directly into a tripod. It can also stand by itself on a flat surface.
If your tripod has a different quick-release shoe size, you can edit the openSCAD file or use the Customizer app. If you're comfortable with more dedicated tweaking of openSCAD code, you can adjust to accommodate non-square quick-release shoes.
The only thing you need other than the printed parts is a hair tie or rubber band.