Should be fine, I'm bad on measurements but its best to not over crowd them. Give them plenty of egg crates, and less males is better per females. 1:5 is usually the ratio but Ive seen people have success with 1:10. I've also read that separating the nymphs from the breeders is also helpful in breeding.
Add heat, heating mats apparently can localize and melt plastic so I personally use a heat lamp for now. Heat tape is a better alternative but is more expensive. Water crystals, orange slices, and gutload.
Do not disturb them unless to feed, they will breed quicker. Hence separating the nymphs so you don't disturb the breeders looking to feed off nymphs.
Some controversial methods:
Give your BREEDER roaches only: chick feed/ cat/dog food along with orange slices, water crystals and some gutload. Protein helps them breed faster.
DO NOT give your FEEDER nymphs chick feed/ cat/dog food, the animal fats can cause gout in your chameleon.