Reddit reviews Triple Cold Shoe Mount Gimbal Extension Bracket, Universal Mic Stand and Light Mount Plate Adapter for Zhiyun Smooth 4/Smooth Q/DJI OSMO Mobile 2/Feiyu Vimble 2 Gimbal Stabilizer Accessories
We found 2 Reddit comments about Triple Cold Shoe Mount Gimbal Extension Bracket, Universal Mic Stand and Light Mount Plate Adapter for Zhiyun Smooth 4/Smooth Q/DJI OSMO Mobile 2/Feiyu Vimble 2 Gimbal Stabilizer Accessories. Here are the top ones, ranked by their Reddit score.
This Universal Extension Bracket, Provide Very Effective Way to Extend the Versatility of Your Gimbal.THREE COLD SHOE MOUNTS: You can mount microphones, lights, recorders or other small devices on this mount, used as an extension bracket of gimbal for professional shootingALUMINUM ALLOY MATERIAL: Made of high-quality metal material, durable to use.With 1/4-20 SCREWS ON EACH: Each of the screws has a 1/4-20 socket on the bottom, so another device such as a tripod can be attached.UNIVERSAL Accessories: Perfectly fit for Zhiyun Smooth 4/Smooth Q/ DJI Osmo Mobile 2/ FeiyuTech Vimble 2 Gimbals
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.
i have these:
https://www.amazon.com/gp/product/B07QYQ7T71/ref=ppx_yo_dt_b_asin_title_o00_s02?ie=UTF8&psc=1
https://www.amazon.com/ChromLives-Extension-Microphone-Mirrorless-Vlogging/dp/B07RDDB8XS/ref=sr_1_17_sspa?keywords=cold+shoe+mount+long&qid=1573765626&sr=8-17-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUFSVzBDOEMwOVVIVFkmZW5jcnlwdGVkSWQ9QTEwMjU2NTAyUkc0UjVHR05CT1E0JmVuY3J5cHRlZEFkSWQ9QTAwNDI3NTEyVDFSQTdQUUZKTllSJndpZGdldE5hbWU9c3BfbXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==
https://www.amazon.com/Extension-Bracket-Universal-Stabilizer-Accessories/dp/B07DTJV2KS/ref=sr_1_1?crid=3KSW2SL72XNY7&keywords=triple+cold+shoe+mount+gimbal+extension+bracket&qid=1573765768&sprefix=triple+cold+shoe+mount%2Caps%2C192&sr=8-1