Well that's fuarked...
My suggestion would be (having been raised in Sydney's Western suburbs), mount cameras where people won't think to look. So not on the wall in the corner, but more at a lower height on a wall with the lens facing up. Depends on the range and vision of the camera though. Many many years ago, a mate had shit go missing and it looked like someone had a key to get in. He set up flood lights but left them on the floor and had the sensor near his shit. Looked like they were lying there waiting to be mounted but he'd left it like that intentionally. Thief comes back, finds out it's his ex selling shit for next to nothing to get back at him... But a few ideas any way. Shit blokes know where to look for cameras and lights. Although, in this day and age, you can get really tiny powerful shit that can be hidden anywhere. Hope that helps!