I got this one a few months ago and have been running it in my basement directly under my living room, separated only by the floor and a bit of insulation. Can't hear it at all. It's been working well and it's a fun low-investment hobby. I live on a glacial moraine so there are lots of unique rocks in my backyard, and my son enjoys digging for them. https://a.co/d/4HSnVVX

I let Home Assistant turn it on once the house is empty, and then off once someone is home.

Neighbours hate this one trick

Rock tumbler enclosure, soundproofing box.

I worry about heat dissipation, but maybe that's considered.

When I printed my "underground newspaper" on a dot matrix printer, back in high school, I thought I'd get away with so much printing without my dad knowing by putting a cardboard box over the printer to deaden the sound. It worked until it didn't. Luckily the printer had a thermistor on the printhead and just stopped versus continuing to brainlessly grind until seizing-up.

We had a largish cooler for fishing. I ended up putting a towel in the bottom of the cooler to absorb vibrations, closed the lid over the power cord. I checked the temperature a bunch at first to check for overheating, but it wasn't an issue.

We didn't keep at it long, but that kept the noise from being an issue. It was a slow, messy process and we were too busy to pay attention to it over long periods of time.

The motor has a power rating. Compare that to a similar light bulb. Done.

It's not that bad. Put a box over it with a blanket or two and you'll be fine.