The main thing you need is a few seconds to prevent a sneak attack
two ways to get into the house (besides windows which you will be able to hear breakage)
Garage and front door...
When my alarm is set in home and away mode I have motion sensors in the garage and plus door sensors.
When I am away at night or go to sleep a door knob security bar is on the front door
This will not keep someone from getting in but should slow them down.
Also have a door wedge alarm
The purpose is to gain a few extra critical seconds.
+ I have a trained attack dog .. No one gets close to the house unannounced when you have a Terrier
Also have a Simplisafe Panic Button installed on backside of headboard, cops are automatically dispatched without a call from the call center