I would guess the real professional burglars are more like in the excellent book & film
Absolute Power with Clint Eastwood as Luther Whitney (master jewel thief). They plan and research the heck out of their target. In the novel he cases the mansion as a carpet cleaner. And in the movie he vaguely hints he had to break into the alarm company HQ to learn how to defeat the mansions alarm system. I don't doubt some burglars at least try that or just bribe/get-someone-inside an alarm company to learn tricks.
The serious pro jewel thief is likely to only go after multimillionaires with lots of jewelry and likely plan to deal with alarms. Big reward with big risk. Big, well trained guard dogs might help deter that. Most billionaires are more nervous about kidnapping of their family, but good security also discourages burglars.
Layers of security like an Onion seems to be the best way. Outer layer is don't brag or show off you have lots of valuables. As for dogs, a well trained and obedient German Shepard/Doberman/Rottweiler usually works well. Crooks really don't want to get bit. Like many times in life, it pays to make people not want to mess with you because it's not worth the problems.
Idiots using Facebook to tell the world when you're not at home is definitely not a wise move.
It Takes a Thief was a good show on this too. I think it was on Discovery Channel. I remember once they even broke into a police/fire station/city hall and got blueprints for the whole town's homes. Research bonanza for crooks there. The chief was surprised.
Reminds me of these guys too. They also were connected to the Mafia. Robbed hundreds of mansions.
https://en.wikipedia.org/wiki/Dinner_Set_Gang
LEO's please keep the real world experiences coming.