Yeah so they’re one unit, you turn it on and then choose to oven, microwave, grill or a combination of all 3. I’ve found combo low wattage microwave with oven to be great at quickly heating frozen food for example.

I think the major difference is that it’s rarer to have a combination stove and oven. The stove is usually separate and built into the counter top, similar to how a sink is installed. I have normal drawers beneath my induction stove, but it’s also common to have the oven as a separate appliance below the stove. My combi oven is above the inbuilt fridge instead. Just whatever the designers of my rental place thought works well, the main point is that they don’t have to be together.

Interesting point on the microwave ovens. I live in the Netherlands and every apartment I’ve lived in comes with a standard combination oven and microwave, i.e oven sized microwave. Is that something standard in the US and not standard where you are?