I like induction but it's hard to find portable induction with a true hob size larger than 6". Any cookware outside the induction disk zone only gets warm, not

I like induction but it's hard to find portable induction with a true hob size larger than 6". Any cookware outside the induction disk zone only gets warm, not really hot. The largest one I could find is the Max Burton 6600 which claims a 9" induction disk but the middle 3 inches of the disk is not energized. I suppose for a 15 amp plug there's only so much area it can safely heat. Maybe built-in ones can be bigger?