Some carpeted surfaces can be very hard, such as industrial carpeting without padding, but most homes use a standard type of carpeting that is much softer. The main point of the precaution is to advise against using on hard surfaces. We advise the use of common-sense safety practices at all times. Another point to the safety precaution is that products cannot be properly anchored with the stakes, but provided you use sand bags for weighted anchoring, this is irrelevant, as the sand bags are designed to make the product indoor-compatible.