In all honesty, speaking to a lawyer, I can't see the financial benefit to you is enough to offset the liability downside , unless your product liability insurance is nearly 50% of the cost to the end user. And the end user clearly needs to understand the firmness of the ground plane is the main key to its safe use. Other then that, I would use a set. grin

Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.