I tape my backing flat to the floor when preparing a sandwich, it hold the backing taunt, so I never have puckers
Also write #s on it and stick to blocks for marking rows or block placements, works for me instead of pinning pieces of paper.
AND never used this tip, but recently seen where someone marked the vertical sides of their blocks on their cutting board for squaring up or checking size. For a 10" block they placed 2- 10" piece of tape 10" apart so they could easily check the block for size