looks like and is a very professional setup and for either of your GoPro's or camera or phone
and they are coming out with a universal action camera mount soon i hope
https://eaglevisioncam.com/product/create-your-own-side-cam-mounting-system-2/
and they are coming out with a universal action camera mount soon i hope
https://eaglevisioncam.com/product/create-your-own-side-cam-mounting-system-2/