I've used this idea for years and my 1/4" are consistently accurate with fast sewing. The 'depth'/height of the full pad allows a wall or barrier of sorts for the fabric to "butt up" against so you are not eyeballing the edge of your foot or a piece of tape, or a bunch/rolled rubber band.
The sticky notepad I use is about 1.5"x2".
I use a rubber band to hold the pad because the metal of the throat plate doesn't stick it very well. I use it all the way around the swing arm of the machine, going under the edge of the extension table of my Bernina, and just move it aside when I change my bobbin. The band I use is a wide one from broccoli or celery stalks.
Sometimes the presser foot has a rear end that is wider than the front of the foot. In this case I move the needle position over to the right to create a 1/4" seam that accomodates the different placement of the notepad along the rear width of the foot.
Jan in VA