The little pigs showed me the way. Here's a bunch of weaners that found the warm, just-cut chips, and they're glued to it. Weaner pigs love warmth. So What I do is use a couple of feet of new chips under each shelter to provide them with it.
With the pile of chips, I'll roll over one of my calf domes and put it right on top of the chips.
The final touch is to put another scoop of chips on top of the shelter. the chips fall off the top, and it helps "glue" the shelter down. The pigs will tend to try to get their noses under it and flip the shelters over. The third scoop on top prevents that. It may provide some additional insulation, but the weight and coverage of the edge is what I'm really after. .
All done. Cozy, warm, ready for occupancy.