As mentioned before, upselling is an approach that cashiers can use to help increase sales and customer loyalty.
When it comes to checkout stocking, it is safer to keep items customers often forget to buy.
Items placed strategically around the register will depend on what kind of products your store works with. However, the following points should be considered:
Photo from Canva
Reference: How to Use Your Checkout Counter to Make More Sales by Kali Hawlk on Shopify