not sure why you think a 240V fridge has to be noisy?
My 12V Waeco was silent but because of how it was mounted in a cupboard that was attached to the bed, I used to feel the compressor kick in. slight vibration.
My first 240V Fridge was a 97L one and was totally silent. I couldn't tell if it was running or not as regards sound. This was one of the 'inventor' fridges sold on Amazon and I know a lot of people have bought the same unit after I posted about it and I don't think anyone has been disappointed.
My current 240V Fridge/Freezer is an LEC 160L unit and again is totally silent.
If anyone is interested I have one of the Inventor fridges for sale. Bought as a spare in case the one in the Camper failed (it was my first try at using a mains fridge so was cautious). Needles to say, it never went wrong therefore I never used the spare and so it is in effect Brand New and still in the packaging.
The original price was £170. Looking for just half that at £85. This is the model here -
https://amzn.to/44c8Noz