It's absolutely disgusting what Tolkien did, that people think this.
Dwarfs have always lived in hills, swamps, bogs, burial mounds, basically anywhere there could be a small pile of rocks. The association was with stones, not mountains. Then some hack writer comes along a thousand years later and says "no, only mountains!" and everyone just gobbles it up. Pathetic.

yeah, they dont only live in mountains. A lot of them actually live in mounds on the surface

I shouldn't be surprised at this point about things I read on the internet.