As with most caged pets. The bigger the cage, the better.
If you get your females at the same time they will get along just fine. And you can add another if you properly introduce them first. People do it all the time.
The facts are quite the opposite. The smaller the cage, the more aggression there is usually.
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1 Rat: (Ace)
1 RC Hamster: (Hannibal)
3 Cats: (Tao, Drew, Jak-ke)
2 Ferrets: (Fisher, Georgie)
1 Betta: (Maxwell) + (5 Platies and 1 Molly)
Rest in peace all my little Mice: Tempo, Aaron, Tatiana, Pei, Shi, Orange, Spotty, Lee Hyun, Key, Calvin, Chun, Jiro, Hero...
And my past Dookers: Lulu (my heart), Frodo (my old man), MoneyPennies (the first one), ect...
Aswell as all my lost Cats (my beloved Haru, ect..) and Bettas (Stahl the creepy one, ect..)