What percentage of transplanted hairs fall off within the first month of surgery?

Roughly what is this range? Or do almost all grafted hairs fall? I want to do FUE and cover up my hairline but rather not look like an ugly duckling with a high forehead for 3-6 months until it grows back. What are the chances some grafts will stay and frame my face? This is the only thing stopping me from going thru with a hair transplant. Rather do SMP first then FUE to avoid the ugly duckling phase (including shock loss).