The 8" Dob is close to perfect for seated observing as it is. Just about any old average height stool will do. When I want a bit of flexibility to handle low-altitude to zenith, short people to tall ones, I take three stackable cheap plastic stools ($5 ea from bargain shop), and stack as many as needed to get the right height.
Putting the Dob on a table is bad idea - unless it's a big heavy table you will get a wobbly set up - not much fun to observe with.
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