Used to live in Kansas - home of 40+ winds and use the rebar solution. They DO NOT BUDGE. Here's a video I made that shows how to get a PVC pipe in the middle of your stone. But there are other ways - some drill holes in the stone - others glue them to the back.
You all are going to kill me but I won't be participating this year. We've got a lot going on at the house (projects) and making a stone during all of it would probably make me more batty than I am. Love you all :)