I have a Hopkins. It comes with a holder that is designed to go with a clearance light or however, but the camera can be tilted up or down in the holder.
I use it for driving where the truck rear view mirror is no use. If mounted low, I would only be able to see the car right behind which would block the view of farther back down the road.
It has optional guide lines you can turn on or off for using it to back up, and a night light you can switch on or off too from in the truck.
One thing with the wifi is there is a time delay to the display so you see a car starting to pass on the display, but it is already beside you. I think it is from "processing time". OTOH when you pass and want to pull back over, when you see the car you passed showing on the display, you are well past him. But do still confirm that with the passenger side mirror!
1. 1991 Oakland 28DB Class C
on Ford E350-460-7.5 Gas EFI
Photo in Profile
2. 1991 Bighorn 9.5ft Truck Camper on 2003 Chev 2500HD 6.0 Gas
See Profile for Electronic set-ups for 1. and 2.