Costco Solar Lights Anti-Tip foot.

thingiverse

I scored some fantastic solar powered lights that can be attached to a fence or freestand, which I actually did. A strong gust of wind came in and knocked my lights all over several times in a row, so off I went to the Temple of CAD for a speedy repair. I added tiny drain holes. These are designed to be set against a wall or step as shown. If someone wants a 4-sided stand, let me know; it would be no problem to make one. (It's included but untested.)