There are already plenty of affordable tripod mounts and smartphone grips available on the market that can help with capturing your photos and videos. The Zecti Tripod Head is also worth a look. It allows for 360-degree rotation, so you can frame your shot perfectly every time. It also has a built-in bubble-level and scale, so you can set the right angle.
This tripod head has a 1/4 screw hole on top for your microphone, LED light, and other accessories. You get horizontal and 360-rotation lock buttons too. Phones from 4 to 6″ are supported.[where to get it]