Where to put wires into car boot for reverse Camera rcz 2ltr hdi

[Chuky9500]

Evening all. New to the rcz
Got an android head unit and would like to fit reverse camera.

Buuuuuuuuttttt fitting it is easy... However, where do you get access from the external to go into the internal for the wiring?
Is there a grommet in the boot on the floor pan? As don't want to be drilling a hole in the boot floor.

I've looked at the video on you tube and he doesn't explain how or where the wires come through into the car?

Any one else done it and have it working? If so where and how did you get the camera wires into the boot. Putting into the cabin will be easy, it's just the initial where to thread them through from the outside into the boot??

Any help would be appreciated

Thank you all

 

[dumdum]

rear left corner of the boot, there's a grommet where the sensor wiring exits the boot to the rear bumper