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Standard ideal height would be 32", but in this case with a 5' 1" chef we would fully customize this for the situation.
Great Question here and the answer is one of how the "chef" of the home cooks and always check the code and manufactures specs on clearances and proper guides for install. Not knowing the model in the Question I would suggest an exercise in pulling the manufactures specs and install guide to see what is required and always know the WHY.