iPhone cameras keep getting better all the time. With a decent iPhone rig, you will have an easier time attaching your lights, mics, and other accessories. The K&F Concept iPhone Filmmaking Rig is an affordable tool that can be mounted to any tripod or slider easily. It comes with an adjustable phone clip and ergonomic handles.
You get a bunch of cold shoes to attach your LED lights, microphones, and other filmmaking gear. You can even detach and use the handles as a stabilizer.[where to get it]