A commercial kitchen does not need a certain number of induction zones simply because it has a certain number of seats. The better question is how many pans, pots, or woks must receive heat at the same time during the busiest service period.
A commercial induction range can perform well during routine prep yet become a bottleneck when several pans, stockpots, or woks demand heat at the same time. That is why power selection should be based on the busiest operating window rather than average daily usage.