I was in an apartment where I couldn't put hardware on a wall. A quilt shop owner told me this is what they do. This was a big shop, and the owner said they take regular t-pins or push pins, and very carefully push the pin through the fabric of the quilt in one corner, then into the wall. The pin doesn't tear any thread because it's small, and just makes a tiny hole in the wall. Medium quilts only need two or three pins, but a very large one may need more. I have done this ever since, with NO damage to any of my quilts.