Not sure at all, all I've got to work off of is the studfinder. Checked out this video and learned that these things are not as reliable as we would want them to be. Just woke up today, going to move forward with my plan of moving over bit and trying again. My father also seems gung-ho about getting some wall anchors and just mounting on the wall since its thicker than regular drywall.

I also like the idea of trying out an endoscope since it seems like a useful tool to have.