I hand quilt, and use the floor to sandwich.... it can be very difficult because the backing always bunchs up when the batting is layed out. I use cotton batts and the fabric sticks pretty well... what I do is lay out the backing, then batting, FLIP the two over and smooth it out, FLIP it back, then lay out the top, smooth, and then Baste/pin.
it may not be the most efficient method, but HEY! works for me :D