After hearing your use case, you should have screamers in your loot boxes, screamers in your air drops, and screamers randomly crafted out of your backpack lol. 12 forges is overkill. Granted you don't have forge mods or perks like I do, I get by fine with 2 forges, but pre a18 I'd never need more than 3 or 4. You can get auto turrets to destroy the screamers, and I've been known to have off site forging facilities. Like you might as well put one in your mine and crank it up when you leave, its so far away the chunk wont load and zeds will never attack it. You come back to mine, you grab your 4000 forged iron on the way out and restock the forge.