I am new to chickens and looking for a little advice. My 12 BR, and 7 RIR are 13 weeks old. I started building the nest boxes. I put 2 boxes at 20 inches above the floor. My plan was to put two more above the first two but, as I looked at them I wondered if it wouldn't be better to put the second set under the first set. This would make the lower set to be about 6 inches off the floor of the coop and the upper set being 20 inches above the floor. Is this an ok idea, or should I put the second set of boxes above the ones that are 20" off the floor. I thought that would make them awfully high. Looking forward to getting feedback.