I have never had very good luck doing it on the floor. Years ago I taped a quilt to hard wood floor and then pin basted it, much to my horror when I picked up the quilt I had damaged the floor. You could see little gouges from the pins, cost $400 to fix the floor they had to sand the whole floor and then re-seal it. Hubby wasn't too pleased. Then I thread basted another quilt to the carpet, so now I use my cutting table and plastic clamps from the hardware store. I have a stool that I can sit on since my back is bad.