Boanerges you are right on spot with that info.
when you have multiple you run the risk of cannibalism.to avoid cannibalism keep them well fed with plenty of hides and deep enough substrate to burrow under things making their own hides.a male and female are less likely to do that but that doesnt mean push your luck with feeding..
a word on feeding
emperors suck at hunting,they wait in their burrows for something to come by and most the times crickets bounce away from em.you can put crix in the fridge for five minutes to slow down but they thaw out quickly and are as jumpy as ever.you can tear off their legs or crush their head but that just seems messed up and depending on your heart it will weigh on it. from my experience its best to feed them with hemostats (i use my fingers when i have a good view of their pedipalps,i dont advice this as i am masochistic).you can also herd a cricket or two into their burrows,sometimes the emps will get em and sometimes they just bounce out.