When doing stained glass quilting with 1/4” black bias tape I use a double needle to sew my strips down. The backside is a zigzag. I’ve not had to make any adjustments other than the normal ones that the thread being used requires. If you don’t mine the zigzag back I don’t see why they wouldn’t work for free motion if you want double lines.i go around curves, shapes when stitching down the bias tape.