Carpet dent protectors

If you recently have decided to change the layout of your living room only to find dents in the carpeting where the furniture used to be, you may want to consider avoiding this in the future by using carpet dent protectors. These protect carpets and small area rugs from dents made my heavy appliances, furniture such as sofas, loveseats, armoires, tall cabinets, grandfather clocks, and the like. Usually sold in a set of four per pack. There are various types on the market, even clear ones.
Carpet dent protectors:

Carpet dent protectors pictured: Adams Manufacturing Caster Cup Carpet Protectors, Large, Set of 4