You need to take in to account the wire gauge from the breaker to the outlet, it's not *just* the breaker or *just* the outlet that dictates the max amperage.

Hey it's your money if you must have a surge protector get one. Also if you want to run two miners on a 15A circuit go for it, but I find it funny you're worried about surge protectors and fires from a surge more than overloading a circuit.

Oh and it sounds like you need a new electrician...