Are you sure about hidden orders on options exchanges? Are you saying that I can send a market(able) order directly to exchange and receive a price improvement? Or by hidden you mean off the exchanges?
https://www.elitetrader.com/et/threads/do-options-mms-see-hidden-spread-orders.325804/
Hidden liquidity and hidden orders are 2 different things. Hidden orders are simulated and withheld from the exchange by the broker if they support that function, like IB. Whereas Hidden liquidity is the price you may get between the Bid and ask.
