I have been getting a lot of cracked eggs from my chickens. So I sat and watched one of the EEs lay an egg. She stood up and when it landed on the hard floor of the nest box (she had spread out all the nesting material exposing the wooden floor) it cracked. So my question is... What would be the best material to use to soften the floor. I was thinking maybe a sturdy rubber mat, or tightly woven carpet?