I noticed that the vinyl soffit material on my house is shaped in such a way that I could clip something into the “beads” of it. These hooks slot into the beads and rotate into place with a nice tight fit. This design might not be useful to anyone else as-is, but perhaps you can alter the project file to fit your needs. If you can make it work on your house, it’s great for Christmas lights – much better than command hooks that fall off every year.