You are correct that heat mats should never be inside the cage.
RHP's on the other hand, they would actually go inside your cage at the top/ceiling. Best recommended ones are from Reptile Basics http://www.reptilebasics.com/rbi-radiant-heat-panels
Or from Pro Products
http://pro-products.com/pro-heat/
For Pro Products just talk to Bob and he will consult with you which model/wattage is best for you according to your cage dimensions and what it's made of.
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