Of all the things that we try to control in our mantids' environment, food, temperature, light, humidity and air circulation. The last is easily the most important in my opinion.
Here's a simple test that you can do to demonstrate this, Alex. Let a few (surplus) L2 mantises loose in yr room and try to forget about them; no spritzing, feeding or tucking in at night. I do this regularly, by accident, when nymphs escape from net cages when I'm not looking. I have had a number of 4th/5th instar mantises show up in the bug room, asians, shields, limbata, Chinese, looking as fit and healthy as their siblings raised in pots. They were never fed or spritzed, but they did fine because they had air circulation that was close to ideal. They tend to live in the bug room because that's where most of the escaped flies are and because they like to laugh at their siblings who are locked up in cages. I'm not suggesting that this is the way to raise yr mantids. For one thing, I don't know how many of the escapees die, just as they would in the wild, but I recommend, like everybody else., that you provide as much circulating air for your mantids as possible, and since you have already bought stuff from Hibiscusmile, I would suggest, with Bassist, that you check out her site for some pots and lids.
Good luck!