This is what I bought. Works great and takes out the wobble. Even with my iPad mini.
Amazon.com : Phantom 3 Metal Mobile Device Holder-golden [90421349] : Everything Else
Had the same problem. Look on line and you'll find a very nice metal one. Can't remember who I got it from. Maybe Amazon. Ones is few colors and works great.
The fisheye keeps the video from jumping around. If you use a standard lens, you better have a stable mount. Plus the depth of field is best in the fish eye camera lens.