Cameras such as the GH5, a6500, and a7 are wonderful video cameras with a whole host of amazing features for filmmakers. Even with their image stabilization, you are better off with a reliable gimbal for more stabilized footage. The Zhiyun WEEBILL LAB has max payload of 6.6lb. With wireless transmission, you will be able to use your smartphone as a real-time monitor or for tracking focus.
The WEEBILL LAB can hold your camera upright or in underslung position. It features double quick release plates and has panorama, focus timelapse, long exposure, and other fun modes.