In my case I have a wood shed just outside of my electric panel and it is isolated from the house by the concrete foundation.
I've wired via a transfer switch, cut a hole in the shed for the exhaust and also installed a large muffin fan to rid any fumes.
A battery keeper/tender (intelligent type) is permanently wired so always a fully charged battery.
Due to the concrete foundation isolating it we can't even hear it running.
LOL, we have so many outages that I never bother to 'exercise' mine anymore.
I do run it dry when I shut it down.
Mine stays under the lean to. The electrical cord is under the lean to.
Just start up when needed, plug in. Power feeds from garage to the house
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