We live in a rural area so there are no "fire hydrants" on the street, which means that if there is a house fire, the only water available will be from a Fire Department Tanker Truck. . . and it is not much water.
What we have that works for us in our home.
3 level home: 5000 + s.f.
3-4 car attached garage.
Commercial grade fire extinguishers:
Home multi rated fire extinguishers:
Large "Fire Extinguisher Balls" (Elide)
Kitchen: over upper cabinets and range hood.
Garage over HVAC systems, etc.
Attic over HVAC systems etc.
For your laptop:
Fire resistant storage box/safe.
I have personally experienced 3 kitchen fires over the decades and it was a fire extinguisher that prevented them from becoming house fires.
3 years ago, I watched a neighbor's 8000 plus s.f. luxury home burn all day and night. . . until there was nothing left.
The fire department and crews tried thier best.
One of my oldest friends is a retired fire captain. A "real working firehouse fire professional (not a desk jockey)" might have some interesting well educated and well experienced thoughts on "fire extinguishers".
In commercial food prep/franchises, food courts, etc, there are various "fire codes" besides "fire sprinklers" that must be complied with.
(dis laimer: zillions of ways and opinionizations about zillions of things based on nil to zero to extensive personal or professional experience. This is only one.)