I say for the blocks you do wat you want. Also on my main non super hostile world, i am makeing a small cave filled with spawners ((yes i has a ghast one in there)) So i can get my gunpowder, bones feathers, string and all that stuff.
Allow it to go into 1 block spaces. That will make non glass windows no the best idea... Also rarely they will spawn in packs of 2. 2 creeps and 1 creeper.
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Ingame name:MrL567
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