When putting together my quilt sandwich I do it on my tile floor. I put the backing down first (right side facing the floor). Then I tape one side to the floor & then go to the opposite side & "stretch" the backing & tape that side down. Then I go to the next side, tape it down, got to it's opposite side & "stretch" it & tape it down. Now my backing is taunt. Then I layer my batting smoothly. The I put on my quilt top (right side facing up) and go through the same steps as I do for the backing. Then I pin baste it. I've used basting spray before in addition to pins but I don't really like to use the spray. I've not had any problems with puckering when I do it this way.