I have a TU46 seed with a quintuple set of spawners if anyone is interested, one of the spawners is about 36 blocks away from the others but with a minecart system it shouldn't be an issue. It's one zombie and everyone's favorite, 4 cave spiders, not exactly the best set but it's the first quintuple I've ever come across. SEED:895636408 The SEED was loaded on classic then expanded to large.
These are the cords
Zombie and one Cave Spider: 379, 15, -811
And the rest of the cave spiders are at: 391, 15, -834 - - - 405, 15, -810 - - - 409, 14, -833 - - - Add me if you would like HankTheYettie