Ed,

Home Deopt has a good product similar to the PanelMate product. Their version is permenant, but you can replace the screw after removing your panels to leave a flush and paintable surface. This also secures the opening in the side of your house.

If you re-use tapcons, the hole in your concrete has the real possibility of getting bigger with each use. After a few uses you may need to use larger and larger tapcons.

I notice that the Florida Home Depot stores have set aside an area specifically for hurricane prep. Ask your local sales associate where these products are found in their store.