The best security system is the 2nd A.
Alarms go off, but that does not stop someone. Some systems call the police, but that does not stop someone until the police arrive. Cameras record & photograph but does not stop anyone. In 95% of the cases the person is going to be wearing a hoody & mask which is common now a days. Cameras alone rarely ID the person anymore.
Your best protection is to learn your 2nd Amendment rights, and get educated on how to properly use a weapon, for the purpose of stopping someone.
And lastly. You can advertise with a sign that you have an alarm, or cameras, but you never advertise or tell people what you have or where you keep your 2nd Amendment rights.