Best way to build it is figure out where you want them to end up (for killing) and watch the spawner. If the mob inside is spinning, it'll spawn. If it's not spinning, you are too far.
It gets harder with multiple spawners. My cave spider farm has 5 spawners and I had the choice of only 2 single blocks that I could stand on and still activate all 5 of them at once.
I mean a spawner like without the actual mob spawner cage thing. I built one of the diamond ones where the water is on a timer and pushes them off. It's pretty tall
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