Where to put hidden camera

[Invinhyip]

I've recently secured a small overlay skimmer for a newer model Diebold ATM, but I have no idea where to put a camera to get a PIN. There isn't much room on the sides of the ATM for a brochure holder (already ordered one), but I'm thinking it may be my best option at this point. The ATM is sunk into a wall inside of a standalone glass vestibule (not attached to a bank or any other building, it's in the middle of a parking lot). I was thinking I could put the holder on the glass; I'm pretty sure a pinhole would be noticeable, but I'll have to check when I get it. I was just wondering if anyone had any alternative ideas, or knew where to get some other kind of overlay to hide a camera in that would be better.