the odd number made me laugh...it's a mystery!
Wildyard, do you need some sticky bits on your rulers? I have used many things over the years, clear polish with glitter in it, nexcare tape, sandpaper dots, yadayada, but I have found these to be the best.
https://www.missouriquiltco.com/shop.../-/true-grips?
I use the centers first, then cut the circles in quarters, and then use the background, used that way there should be enough stuff here to cover every ruler anyone has. Well worth the money, for future cutting needs. My rulers are pretty small so put them in the corners, that isn't where we are looking so no vision empeded. On large rulers I'd put one in the center too