I baste all my quilts - from baby to king - on my craft table. Granted I normally pin or thread baste - not spray/glue. But I start in the middle of the quilt, clamp down all four sides using binder clips. Get the center of the quilt basted and then shift everything as needed to get the balance of the quilt basted. It can be tedious but at least I'm not crawling around on the floor! I'd probably never be able to stand again if I basted on the floor!