Someone posted about using their Q-snap floor quilting frame for tying. They started by laying one section of the sandwich at a time on the frame and then putting on the snap part to tighten a section at a time. When that section was smooth, they put in their ties and then moved to a new section as needed. It sounded like something I would try the next time I wanted to bast or tie a quilt. I already have a Q-snap floor frame.
The last quilt I tied, I smoothed all the layers out on a large table. I clamped the 4 sides to keep it from moving. I then threaded a needle with a looooong piece of embroidery floss and took a 1/4 inch stitch through all the layers at 4 inch intervals. I just clipped between the 4 inch sections and tied the ends in knots.