Simple Spawner Blocks 1.10.2 & 1.12.2 Forge Mod Overview (1.12.2 doesn't have all)
1.12.2 only has Enderman and Remote Redstone blocks, just a warning. A mod that adds spawner blocks for mobs. Just right click the spawner block once you have a Remote Redstone block in the area and they will spawn.
Mod Link:
https://www.curseforge.com/minecraft/...