Reddit reviews Nechkitter Dual Twin Mount Adapter for GoPro Hero 2 3 3+ 4 5 6 7 Compatible with Housing Handle Monopod Mount
We found 1 Reddit comments about Nechkitter Dual Twin Mount Adapter for GoPro Hero 2 3 3+ 4 5 6 7 Compatible with Housing Handle Monopod Mount. Here are the top ones, ranked by their Reddit score.
Allows to mount one standard GoPro like hero 4/ 5 6 and a small size gopro session on the same horizontal level . While two standard size gopro can only mount one face forward and one back to record immersive footage simultaneously.can put a fill in light and a sport camera together, helping you take immersive photos in the dark.Fits GoPro Monopod Selfie Stick, GoPro Head Strap, GoPro Chest mount harness and most GoPro Hero accessoriesMade of high quality material, durable and sturdy.
Oops, I realized I did not fully answer your question.
The mounts that hold the camera to the phone have a 1/4-20 hole below. I haven't seen any with gopro flanges. You'll have to use an adapter.
Would this one work? You may already have the parts to build it yourself. You could also build one around a dual gopro mount or a plate like the one included inthis kit.
There's also this one.
This other one has lots of 1/4-20 threads where you could screw on a gopro adapter.