Can I put the money under the quilt? What did Feng Shui say?

Every place has a different story. I know a few places where I can put it. Newly-married entrepreneurs deliberately put money under it. This is called "betting". Put the money in the folded quilt. The custom of calling it "more money than children" is a bit strange everywhere, but it seems that I have never heard of the negative statement of putting money under the bed.