Stand Up Tanning Booth When You Use A Stand-up Tanning Booth, Do You Undress Inside The Booth Or Elsewhere At The Salon?

When you use a stand-up tanning booth, do you undress inside the booth or elsewhere at the salon? - stand up tanning booth

I am thinking of going to Hollywood Tan salon [Southern California] next week, and I want to know exactly what to expect. I am planning a solarium, but I've never used a vertical support, so I'm not sure whether to keep my clothes while I am Tan.