Sidera, I use the same clips to clip the fleece to the coroplast, not so much to prevent burrowing but to stop the folding (sound familiar anyone?). I also use them to clip towels as covers for their shelf cum hidey. My girls ignore them. I think having lived in an acquarium, they now have other things to amuse them in the C&C.
I used binder clamps to hold my fleece in place too. A few members warned me against toe nails getting caught. I had mine holding the fleece on the coroplast with the handles facing downward and also flat on the surface of my ramp. I can certainly see how that would be a nail catch risk so I ended up just popping the handles off between cage changes.
My pigs (taught by Spike) grab the wire part and pull on it until it snaps up. I didn't think it was dangerous until somehow Spike snapped one completely off and the wire fell into the cage. Never had the toenail problems though.