Rather than buying those ridiculously expensive anti-slip mats for a rug, just turn it over and run a few lines of acrylic-latex caulk every 6 inches or so. Let dry and flip over and your rug wont be going anywhere!
How to clean a wool rug-Bob Villa MATERIALS AND TOOLS - Vacuum - Rubber gloves (optional) - Rug shampoo or mild dish detergent - Bucket - Sponge - Soft-bristled brush - Squeegee - Water—lots and lots of water (i.e., get your hose out!)
Seriously, a DIY rug from a drop cloth, fabric & sewing machine! WoW!! Supplies: tacky glue spray, Home depot 6x9 drop cloth, 2 yards of wide heavier weight fabric, Carpet gripper, Sewing machine, thread & an iron.