This is very functional & rational. I found a washbasin cup that is easy to dry and saves space.
A product called "QUALY Toothbrush Stand and Cup Flip Cup". There is a hole for a toothbrush inside the cup, so you can use it as a "cup" while brushing your teeth, or as a "toothbrush stand" by turning it upside down after brushing your teeth.
The part that your lips touch when rinsing your mouth is curved, and when you turn it over, it floats from the table. And the inside of the cup is easy to dry because air passes through this gap. It seems that if it dries quickly, it will be easier to maintain cleanliness.

A toothbrush stand and cup with a clear and fashionable design. Why don't you use it in the bathroom at home where you want to look refreshed, or in the bathroom where you can't put your personal belongings? I bought it from Amazon.co.jp and the price was 1,080 yen.