Hello,
I read too many topic related camera/gopro/phone mount. I am using two phone to record games. This solution maybe help others. It is realy cheap solution to mount two device in one tripod. And you can set your camera angles if you have some stitching problem. I am also using this tripod mount adapter for phones. Both products are cheap and universal you can find any country or website.
Just mount your go pro / phones with 1/4 screw and set angles. That is it. 
