Accessory Socket in rear (VX Wagon)

[Nedlam]

Hi guys
Im going camping soon and I have a car fridge to run while travelling . I need to add an accessory socket in to the boot area of the wagon to run the Fridge.
1) is there an easy way to run this cable.
I saw a youtube video say running in the headlining, but that was 4 a rear view camera dash cam.
2) is there an area in the boot I can mount the accessory socket. Im thinking next to the door near the RH tail light.

Thank you

 

[rambunctious]

I ran the wiring for this one along the sill then into the cargo area..
Easy enough.
It's to power a camera.