I only have two cats and my place can be like a zoo sometimes. I can only imagine the "fun" you're having. My cats co-exist (mostly peacefully) but they don't particularly like each other. The last two days, the male has decided to be all territorial - wherever the female settles, he goes over and chases her off and settles there.
I try to let them work it out on their own as long as it doesn't get ugly. If the female would just stop acting like prey, he'd respect her turf and chase her less.
I love sci-fi, but never enjoyed zombie stories of any kind. But I'm glad Netflix finally has something good for you to watch.