skyblock spider spawners

[Admiring_squid]

Just a question, Do anyone know how many blocks beside the spawners the spiders can spawn?

Because im going to build a spider farm but they spawning outside.

 

[Xavi | Goofy]

Spawners spawn mobs 4 blocks (horizontally away from the spawner), 2 blocks under the spawner and 1 block ontop.

 

[Admiring_squid]

Spawners spawn mobs 4 blocks (horizontally away from the spawner), 2 blocks under the spawner and 1 block ontop.

okay thx