What do you put under a kilim rug?

Could you please elaborate on what exactly should be placed beneath a kilim rug? Is there a specific type of flooring or padding that is recommended for optimal comfort and protection of the rug? Is it common to use any specific material or tool to prevent slipping or ensure the rug stays in place? Also, is there any particular cleaning or maintenance consideration one should take into account when deciding what to put under a kilim rug?