Some retail shops make it really hard to find their QR poster. Maybe just one, hidden from easy view.

My local 7/11 had one on the front door, as soon as you approached it, the door opened automatically. Some people are really smart!!

KMart, Big W and other shops in my local Westfield today had marshalls at the entrances, checking everyone going in. Less than 50% actually checked in at the main entrance.