Using mounts i had lying around.
1. Flat adhesive mount.
2. Mounting buckle.
3.1/4 gopro adapter.
4.1/4 phone holder.
Step 1: Mounting the Mount.
I used a knife to cut away the protective backing of the adhesive area i needed to paste the mount. The curve mount could mount on a ds4 controller.
Step 2: Finishing Up
Mount the buckle, the 1/4 to gopro adapter & the 1/4 phone holder.
Step 3: Minor Issues
The thumbscrew will prevent your index finger from gripping the controller. There might be a shorter thumbscrew than this but this works fine now for me.
Step 4: Lean Back
My sp gadgets buckle was shorter than the gopro ones. So if you're using a gopro buckle, it might not be as tilted back as this but i can live with this as i use it to fly my parrot minidrone and not look at the phone's screen as often.