Fielhogar review for Point of Sale

Right now I'm using Shopify POS for inventory replenishment, we have 7 physical shops and they are ordering the products they need via this app. I cannot justify 89$ a months because it has a big problem, I need to set up minimum orders for the products, and that's because of the boxes, the standar box can contain 6 or 12 products, so I need that every shop orders a minimum. Shopify POS doesn't have that option, I tried using variants but every time you scan a barcode It's not showing correctly the options.