Brokkr

With the plug in models that’s about the biggest you’ll find. Full range cook tops will offer larger diameters.

If you’re searing or pan frying, then a 12 in might have some cold spots towards the edge, depends on the quality of the pan. A 10 in or less should be fine as long as the pan is decent quality. For something like deep frying, stewing, boiling, etc the size won’t matter so much.

Get a decent counter top induction plate. Don’t get a fancy one, because they are all limited to the same power. So get one that has the basic features you might want to try. Also try to get one with a reasonable size heating zone.

Then get a good solid stainless steel or cast iron pan.

It won’t be quite the same power level as a full cook range, but it will show you how the heat can be managed. It will probably be able to boil water faster than gas, but not quite as fast as a modern electric. Try something that requiresgood heat control, like pancakes.

These induction plates are also just generally useful for doing stinky/messy things outside or adding another burner to the kitchen during big holiday or family events.