At our house, we have one camera set up which can help view people who come to the house since its facing the porch. Problem is; what if they try to break into my car and I miss it? I figured out a way by spending a buck.
I purchased a little mirror that I can angle facing the other side not viewable in the camera's position. Now I can see both angles without wiring up another camera. Best of all, I only spent a buck. I could imagine using a foldable mirror so triple angles will be featured. Ooh yeah, to be continued.
Very smart, very budget wise, a win win!