The rear corner section has two self tapping screws and pop rivets holding it in place, the rear wing is the same set up, just drill the heads off the rivets
Unfortunately, I don't see the rivets. I am talking about the outer - vinyl covered - "D" post trims. I see where they are screwed on in the boot void but cannot see where the outer bits are screwed or riveted on. It looks like they are bolted and the back window has to come out to let u work in there
There are two screws on the rear most edge, and 3 screws on the forward edge. The forward screws are screwed through a plate about an inch wide running vertical up the panel inside the vehicle. I can’t be sure if you have to remove the window, maybe a land rover supplier could verify