Hi Patti
I placed the base of my umbrella next to the steps. With the tub empty, I did not have much problem sliding the base under the corner of the spa.
Since it is a cantilevered umbrella, it will cover the spa from any position, but having it next to the steps, I can also use it as a handrail for getting in and out of the tub when it is closed. I can also swing it away from the tub when its open to provide shade for chairs on the patio.
Good luck and happy hottubbing!
Rich