If you can find an old Ikea "Svenerik" piano stool, you are good to go. The more recent metal version is the "kullaberg":
https://www.ikea.com/au/en/catalog/products/30363650/
Or similar. I've seen piano stools in 2nd hand shops for peanuts.
Personally, I stand to observe, but do have an Ikea "Bekvam":
https://www.ikea.com/au/en/catalog/products/50225592/
and a "Frosta":
https://www.ikea.com/au/en/catalog/products/60162301/
if I have the desire to sit.
The step-stool I also use as my laptop table during imaging.