Installed two original dome lights on the rear hatch interior cover. Connected them to the main trunk interior light and installed two LED bulbs.
Happens for a very nice lighting around the car if you have a trunk kitchen.
I only wired them with the "DOOR" position without the "ON" position, so when I close the hatch, they turn off. This way even if I forget them, they'll still turn off when I close the hatch. Otherwise if you wire the "ON" position and switch to it, when you close the rear hatch, you wont see they are ON if you have tinted windows/rear cover on...and then you can't leave home...or get home!!!
You need to run power from the constant 12v of the Back door ECU to both lights directly on the bulbs' ends, and then run wires from the "DOOR" function of both lights (connect them together as one wire) and run it up the left hatch pillar to the trunk's interior light's Green/Red wire - or the one that does not have constant 12v - that wire goes to the combination meter that allows to ground the interior trunk dome light to turn ON when the comb meter receives signal that the rear hatch is opened.
Here is a schematic and a pic of the final job. The schematic is a general sample one and should not be taken for granted. Make sure you understand your car's wiring before starting. Attempt at your own risk.