Celestial Island Capacity?

Maybe I’m dumb and overthinking it, but I just want to make sure before I spend the time working on it…

I know you can have 5 of each monster, but can you have 5 of each of the 12 monsters at the same time? So basically, can you fit 5x12 (so 60 monsters total)? Or should I only go for 2 of each type?