Modular kitchens come with at least 2 base units, one for your oven and one with drawers and shelf space, which you can use as a countertop for working in the kitchen. The base units are designed to accommodate the hob, which is basically your cooktop, and sometimes the kitchen sink.modular kitchens come with at least 2 base units, one for your oven and one with drawers and shelf space, which you can use as a countertop for working in the kitchen. The base units are designed to accommodate the hob, which is basically your cooktop, and sometimes the kitchen sink.modular kitchens come with at least 2 base units, one for your oven and one with drawers and shelf space, which you can use as a countertop for working in the kitchen.