Thank you, everyone. I enjoyed reading your responses.
The size of the dish was approximately 4 hamsters x 2 hamsters.
Today I bought a corner litter pan to try. Zoe is asleep now so I will see how she responds to it when she awakens. I like the enclosed sand baths, but they all have holes on top. Zoe likes to jump on everything so there would be a risk of injury to her paws/legs if one went into a hole.
It looks cute to see a tray of sand with hamster footprints in it.