American style fridge freezers- advice please

Hi, we’re moving house and need to choose a fridge freezer - I’ve always found the plastic drawers in freezers often crack over time so am considering the smallest American type - with the fridge on one side and freezer on the other - does anyone know if the freezer still should be filled up or if this type needs air to circulate around? basically the freezer is bigger than we would usually have so I don’t think we’d ever fill it - also it’s shelves rather than drawers so would be difficult. Thanks in advance