Depending on the dimension of your space, perhaps a longer, but more slender rectangular shape would work best. You want to consider the functionality of your space and how it's used. Where is the most traffic, what space is never or rarely infringed upon. From there you can decide the shape that will work best. Try putting painters tape, blankets, cardboard, etc down to see the size and/or shape table works best in your space. This should be a good starting point.