Do I have to mount iUSBportCAMERA on the camera hot shoe? How do I use iUSBportCAMERA with other hot shoe devices like flash, wireless transmitter, triggers etc?

iUSBportCAMERA only needs to connect to the camera via the USB cable.

You do not need to mount the iUSBportCAMERA on the camera hot shoe for it to work. iUSBportCAMERA only has a cold shoe accessory mount for physical mounting purpose. Cold meaning there is no data connection between the camera hot shoe and the iUSBportCAMERA device.

If you need to use the camera hot shoe for other devices like flash, other wireless transmitter or triggers, you can always velcro the light iUSBportCAMERA device to the side of the camera, tie it to the camera strap or stash it in your pocket.

In addition to the cold shoe accessory mount, there is also a tripod mount so you can also mount the iUSBportCAMERA beneath the camera or on brackets or tripods.