Just wanted to add a thought I spotted in another thread about home security - “if someone decided to break into your house, they’ll do this way or the other so there is little sense in being too paranoid about insecure communications between your sensors and a gateway”.
And I know stories about thieves who had only 15-20 mins and yet managed to take a lot and get away.
So the point is perhaps you need a not too complicated (easy to use) home alarm but it’s very important to make your house look “protected” and not empty so they just go elsewhere. And if they get in - make it as difficult as possible for them to stop any audio-visual alarms (which will trigger if you use even a simple combination of door/PIR sensors).