Here's a couple on EU. High quality zones have an foundation. Quite often a high candle body using a move away.
Yellow boxes are engulfing, red arrows are retests once they became zones. You are able to get engulfing reversals and engulfing continuations which will become zones.
I normally examine the candle body when molds and may already see it is going to form a zone until the indior prints.
Not certain why I did not exchange this setup to be honest. Still a little rusty after a fracture and being overly careful.