As an iPhone filmmaker I allways have a look after the functionality, the size and the performance of my gear.
Everything works around my Triad Grip mount. It carries my iPhone (6 or 7 PLUS) on a shoulderpod mount, a manfrotto spotlight (ML840H), a RODE videomic GO and a extra battery from duracell for about three extra charges while filming - enough power for a whole day of filming.
In all cases the iPhone, the manfrotto spotlight and the RODE mic are both small and powerful.
The Triad Grip gopole and the shoulderpod (proper name) are both very solid mounts. Solid enough for every mission.
All of this gear offers a very fair price-performance-ratio.