We have had our alarm with ADT for years. They also have a guard service, so if the alarm goes off and they call you and you don't answer, they will send one of their guards out to check the property, before calling the police...as here if it is a false alarm, you are fined by the police. We have glass break sensors on all our windows, sensors on our doors, motion detectors... we basically got all that we could, lol.
We also have cameras, they are not through ADT. But are the Arlo ones and they are really good.