My compost bins are plastic trash cans from Home Depot. I drilled 1 inch holes all around including the lid and the bottom. I made 2 indentical bins. I read somewhere in the past that the bins should stand on bricks for the air flow. So that's what I did. But now I want to follow your idea and let the bins touch the ground because I don't see any of mealy worms I had put in about 2 weeks ago.
Also, I don't see any red worms either. I had put 3 worms in there about 4 days that I found by digging into soil when I was planting some perennials.