When the power went out in ep9, the camera went out and that's why Derek discovered it. But the camera could have been discovered during the repairs, since they were changing the wiring and discovered the camera beforehand, but they didn't. So whoever rewired Derek's room was the one who installed the camera beforehand.
But it was weird to me that they left the camera there in the end anyway, knowing that it was Derek's room and no one would go there to fuck again.
The camera was hidden in a light fixture, and the light likely wasn’t broken when Caleb rampaged through the mansion, so there was nothing to repair in the closet, and nothing they would have discovered.
Now they
did install the chandelier when Derek turned it into a bar. At which point they had to have cut the electricity to the room to wire the chandelier—thus knocking out the camera. But it’s plausible to imagine the camera is wired to a different circuit, and therefore wouldn’t go out until someone shut down
all the circuits at the Halloween party. Still, when you’re installing and wiring new things in the ceiling, you
should notice everything else installed in the ceiling—including clandestine cameras.
Anyway. Whoever installed the camera, knew DIKs went in there to fuck, and wanted photos. Once it became Derek’s room,
one DIK at least was still doing his fucking in there; once Derek turned it into a bar, it became sort of a public room again, and anyone could fuck in there—and likely did. Although that chandelier likely obstructed the view.
$10 Cosmetic poll: Camila
Naked is always the right answer. But meh; I’ll settle for #2.