Bike got stolen tonight, Dalston

has anyone found any lock/locking (ahem) strategy they can rely on? sensible and daft options welcome. considering wiring up the frame of my new bike to the mains or a car battery overnight. surely you can get a gps dongle or something hidden in a seat post or something nowadays?

Two d-locks through frame, wheels and immovable object (making sure the d's are "full" so a car jack/lever won't fit in) behind a security pass access door which is behind a 24-hour security-guarded pass-checking entrance gate.

And that's not perfect nor will anything ever be 100% secure. You do what you can.