I use the floor. Use to baste now use safety pins. Since I FMQ had problems with pleating underneath. A quilting friend told me to( pin suggly) the back to my carpet, then add batting +top then safety pin top with pins apart no wider than a hand span. Think I will have to get a quick clip as last king size had 100's of pins! Am over 60 and this part of quilting is the least favorite.