Put more bluntly: DON’T use a surge protector. Ship’s electrical systems cannot handle a sudden disruption in power flow because of how they are wired, and how surge protectors are manufacture to work.
Your home electricity has power coming through one side of the recepticle, and then it returns via a neutral wire. The surge protector only disrupts the flow of the live side.
On a ship, there is current traveling through both sides of a plug. And when one side is disrupted while the other continues to deliver a charge, there is a risk of not only a fire, but a fire anywhere in the ship where the wiring also travels besides just your stateroom. Think of a baby’s cradle on another deck being exposed to fire because you tried to sneak a surge protector through.
Power strips without surge protection are fine. Power strips with surge protection are banned.
If anyone brings one on board, the rest of the ship should HOPE it gets found and confiscated.