Anyone know how high up i gotta be from the ground and how far i gotta be from any of my build or farms,

So im trying to build this one shulker design that produces 35k shulker per hour, and i want to build it near the center of my world the only problem is idk how far from blocks or builds and how high i have to be inorder to build this farm. Im afraid that once i build this farm the shulkers will teleport to some of my builds/farms because im way too close to it, and i dont wanna redo the entire farm—so im making sure that im safe from that problem.

Does anybody know the answer id really appreciate it