Probably incorporate some of BurnNewHistoryBooks comment, specifically bunging off the rest of the car downstream of the mirror.

If you go with duct tape, you might try plastering over it, sanding it, and painting it to match your car color to avoid police attention.

Adds some cost. Probably looking at $20-30. This seems easier and more permanent. https://www.ebay.com/itm/166777157608

Probably incorporate some of BurnNewHistoryBooks comment, specifically bunging off the rest of the car downstream of the mirror.

If you go with duct tape, you might try plastering over it, sanding it, and painting it to match your car color to avoid police attention.