I'm at lunch right now, so pardon the brevity, but the lamp assembly is about 1/2" rearward of the edge of the trunk (sorry, boot!) lid, and centered across it. There are holes not only through the lid itself, but also the internal reinforcing member to gain access to the retainer studs. The wire leads look like they branch off the lighting section of the rear wiring harness (obviously a North American feature-- you'll have to tie into your brake light circuit back there). The leads are jacketed and feed from under the rear of the trunk up into the lid via an access hole.
I realize you like the appearance, and it could possibly benefit you one day in traffic, but I suggest if you drill the holes, then file the edges smooth and touch the bare metal up with a rust preventer such as Extend. Then once it cures, apply body color paint to prevent rust.
I realize you like the appearance, and it could possibly benefit you one day in traffic, but I suggest if you drill the holes, then file the edges smooth and touch the bare metal up with a rust preventer such as Extend. Then once it cures, apply body color paint to prevent rust.