Yeah I’m guessing there must be a law about putting the unit prices already or else why would they even have them, so it seems an update might be useful.
I can remember using them like 10 years ago…
Thinking about it a little more I bet it is very difficult to legally define a product type.
They manage to do it for sales tax.
They could go by whichever the product itself shows most prominently, or require both units if 2 units are shown.