Do the world a favor and get German Shepherds instead.
I actually looked at German Shepherds and Dobermans, which is what I’ve had in the past. We actually had an issue with the Doberman being overprotective at times. She snapped at someone who approached the car once.
These puppies needed rescuing and our vet trained them herself. After almost 2 years, no issues at all. These two are much more friendly than the Doberman by far, but don’t tell the burglars that.