The bad thing about living in a household with more than your significant other is people (children, siblings, room mates?) sleeping in multiple rooms. For my particular situation, there are no small children but there might be a situation where you have to round up the family before barricading and that would require minimal clearing to get to some very specific areas of the home.
Your best bet is to have a plan, and to have your family know the plan. I do live only with my SO, however, that has not always been the case. The way my apartment is laid out the bedrooms are at the end of a hallway so my barricade position is simply the doorway to the bedroom. No one can access the other bedrooms without going through the death funnel. Similarly, at my parents house and my previous apartment all the bedrooms are on the second floor, so it's a similar situation defending the stairs. A person suddenly confronted with a bright light at the top of the stairs or the end of the hallway faces the daunting prospect of guessing what is behind it. Few would charge into the bottleneck without cover and those that would face a perforated demise.
The time when you really have a nightmare on your hands is when the bump in the night that wakes you isn't the front door getting booted in, but a disturbance in one of the bedrooms. Now the game has gone from defensive to offensive
That's what great about less lethal rounds...3-4 Rounds of bean bag and then a slug/or buckshot if it get's too dirty (plus, it'll give ya a better chance of notting getting hung out to dry in court). Chance doesn't just favor the Brave...it favors the prepared as well...
There's nothing great about less lethal rounds in a civilian defensive setting. Not only is the legal standard for using them the same as using lethal force, but when your confronted with someone firing real bullets, the last thing you want is to have to go through 3-4 rounds almost guaranteed not to end the fight, and probably sending your opponent scrambling for a more covered position to shoot at your from. Police will almost never deploy less lethal weapons in a potentially deadly situation without having another officer present to provide lethal cover.
You say: "every step you take towards to give yourself the advantage, your chances of coming out of a situation alive greatly increase." Take your own advice, the best step you can take towards giving yourself that advantage is to have the first load out of the barrel be capable of ending the fight.
The purpose of adding light to our rifles is to help us identify the nature of the threat. If it is a lethal one, we want to immediately respond with lethal force. If the threat is anything but, hold your fire. Using less lethal munitions still carries with it the risk of death. They are not called "non-lethal" for a reason. They take a beanbag in the wrong place and you have a dead person that may not have justifiably needed killing