Meet the Glide Gear OH 200: a modular, adjustable smartphone rig that lets you use your iPhone to capture overhead video like a pro. It comes with a 15mm overhead rail system with multiple 1/4 and 3/8 mounting options. Its height can be adjusted from 23 to 36 inches. You can also add more 15mm rail section.
The OH 200 can be assembled and disassembled pretty quickly. It ships with a phone and tablet mount. It has an aluminum and steel construction.[where to get it]