First off these are cheap knockoffs of rulers from Sew Steady and most people who have bought them are unhappy with them as they are made poorly. I have several rulers/templates from Sew Steady and have done several quilts with them. Janet Collins and Angela Attwood have designed quilt tops that are wholecloth done with rulers. If you are using a domestic sewing machine there are different ruler foots and rulers that each machine uses, check Sew Stead website for your particular machine. I have 2 Pffafs one uses a low shank and the other uses a medium shank and both use the low shank ruler/templates. Angela Walters also sells rulers in both 1/8" (low shank) and 1/4" high shank, the height of your shank determines what height ruler you need.
I am attaching photo of Janet Collins and Angela Attwoods quilt that I completed. Quilting with rulers is fun but like FMQ it takes lots of practice and patients but there are lots of videos by quilters teaching the process.