Last year we had a Generac 17kw standby home generator installed - it’s piped directly into our house propane system and kicks on when the main electricity goes out for more than ten seconds. It runs everything from the well pump to the furnace and appliances and was right around ten grand. Not cheap but my wife is disabled and I’m not getting any younger.
My next-door neighbor’s wife developed COPD and couldn’t afford to be without power. He had been using a 5.5KW gas-powered portable but there was a considerable amount of attention that needed to be paid to it.
After several seasons he bit the bullet and bought a unit similar to what you describe. All automatic. Natural gas powered. Would run almost everything in his house.
He gave me the 5.5KW and I’ve been using it ever since. At some point I will upgrade to a whole house unit but 17KW seems like overkill for my needs.