Hello XXXXXXX,
Welcome to Just Answer.
I would use a non slip rubber carpet pad; these work great for these type of applications. You can find these at your local craft store/ carpet store/ home improvement store.
Here is a link to the pad I am referring to.
If you need further help or clarification on this question, please reply to this post.
Best of Luck, Brian
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Architect
Licensed Architect- 12 years, L.E.E.D. AP, Former Remodeling Contractor- 10 years