You really need at least one firearm for every room in your house since you never know where you might be when a break-in happens. In fact four per room, one on each wall, since you never know where in the room you might be either. Each weapon should also have a backup in case the primary misfires or jams. So if you have a seven room home then 56 weapons should suffice. That’s what I’m shooting for, no pun intended.
Finally, someone who gets it!