Flir One is very wobbly (possibly also danger of damage …) and not very handy under an Android smartphone.
3D-printable holder for smartphones (Universal, or with removable frame) and Flir One.
With tiltable Flir-One holder.
With attachable gun handle and optional photo thread (1/4-inch).
There are cheap adapters 1/2 “on 1/4”. So we could screw it into a printed 1/2-plastic thread and stick with super glue. Then we have an exact metal thread.
Possibly. It can also be designed in such a way that it can also be mounted under a drone.