I'm getting annoyed with the difficulty of cleaning my hob. It's an old iron plate thing. So I'm looking at an induction hob. Standard 4 zone, 60cm jobbie. Hopefully a drop-in replacement. But there is a knife draw immediately below it. So I need the hob to be very shallow. The countertop is 4cm thick. And I don't want to be heating the knives. What do you recommend?