I tape one to my stock that I can check after using the range finder and adjusting my scope. I have also taped one to the inside of my non-trigger arm that I can check without pulling my head away from the stock. (Hint, this works best with long sleeve shirts, especially if your arms were hairy!)
"When working with the public, there are two things you need to remember. - 1. The public is a bunch of ignorant morons. - 2. YOU and I are one of them!"