Several iron farms next to each other?

I have a Minecraft survival world and want to get as much iron as possible. That through an automatic villager - zombie farm. You can't build them too close to villages. Now my question: Can I just put several of them next to each other or does that justify itself?

You have to keep the farms some distance apart, otherwise the farms will not work efficiently. I would recommend a distance of at least 20 blocks from the villagers.

Otherwise I would advise you to watch a video on YouTube because there's one that deals with that exactly, unfortunately I can't find it with me anymore.