Yes and yes

Not really, my family looked at me like i was mad when i suggested it. Got an out of date powder extinguisher from Volvo tho. Seems to be intact

I have one and pressure is OK (at least if the gauge isn't stuck). Is there anything else that you can check yourself instead of having it professionally inspected once a year? Does anyone know what they inspect?

Yeah, three. One in the kitchen, one at the bottom of my basement stairs, and one in my laundry room.

I have 2. One in the kitchen and one in the garage. It's a cheap insurance

Yes and yes, bought it for PCB rework but in general we should all have them.

Not directly in my home, but there‘s one in the stairway

I have a few in the house and one in the car. I just updated the batteries in all my smoke and carbon monoxide alarms too.

I do and I get it checked and retagged every year.

One in the kitchen. One in living room next to the fireplace.

Yes I fire extinquisher in my home all the time

I have five! And I just checked them as part of my semi yearly maintenance.

Kitchen under stove, laundry room by dryer (wife and kids refuse to empty lint trap, smdh), one each by both furnaces (different parts of the basement), and one in the garage.

Never had to use one, hope to never have to.

One for every room I intent for humans to survive in, plus one in each car. Also recently upgraded to hardwired CO/smoke detectors and each bedroom also has a combination alarm that uses Z-Wave to alert me anywhere, just as a backup. Also, we practice fire and earthquake drills monthly, along with a couple of other scenarios that are more rare/less dangerous.

Yes, and yes, that's what maintainence is for.

Yes, one in the basement and one in the kitchen

Yes; yes.