Mine is installed on a 2015 Indian Roadmaster. I had it installed by the technicians at the dealership. The front camera is mounted between the front forks under the bottom fork tree. The rear camera is mounted underneath the trunk/tour pack. They installed a switch in the dash to provide an on/off power control to the unit. The DVR and GPS are installed inside the trunk. The emergency button is there as well, but I'll likely move it outside along the seat since I've had occasion to want to preserve a video.
Attached are the installation photos.
DVR and GPS Mount on Trunk Lid
2. Front camera under bottom fork tree.
3. Rear Camera
Power Button on Dash Under 12 Volt Socket.
Save Button under seat heater buttons. I mounted this here with heavy duty Velcro so that it can be reached and also easily temporarily removed when the trunk or seat have to be removed for maintenance etc. In hind sight I wish I had the technicians mount this in the dash on the other side of the dash where there is also a blank socket.