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Everything told to you was incorrect. for a 27" oven, you do not need another 1/2 inch. The height may very but you'd have to measure to know for certain. The width of the oven will be the same, but if the height is different you may have to cut your cabinet slightly or use a filler piece of wood to cover the gap.
Also, a 30 amp breaker is not sufficient for a double oven, you still need a 40 amp or 50 amp breaker (you do not need to change to a 40 amp if you already have a 50 amp breaker). 30 amp breakers are for single wall ovens.