ive never used a quail carton, but to be safe i would poke a hole in the bottom. you can never have to much ventilation inside your incubator.
someone else may have a better idea but, assuming they are like chicken egg cartons; i would cut the lid off and cut the carton in half lengthways. i would lean the first part at about 45 degrees against the wall of the incubator, then lean the next row against the first. when i got to the last one, i would put some paper to help make sure it stays at 45 degrees. when its time to turn i would move them to the opposite side of the incubator, leaning the opposite way.
someone else may have a better idea but, assuming they are like chicken egg cartons; i would cut the lid off and cut the carton in half lengthways. i would lean the first part at about 45 degrees against the wall of the incubator, then lean the next row against the first. when i got to the last one, i would put some paper to help make sure it stays at 45 degrees. when its time to turn i would move them to the opposite side of the incubator, leaning the opposite way.