However, with an appropriate supporting structure, you can also hang normal wall cabinets flush with the tall cabinets. It shouldn't be any deeper up there anyway, because shorter people can't reach it. Nevertheless, there should be an attachment cabinet for refrigerators that is 60 cm deep. Basically, you could use any base cabinet carcass for that.
Elevated dishwashers are a DIY job at Ikea, since you first have to create a substructure, put the dishwasher on it, and then have further cabinet compartments above it, either with side panels on the right and left or tall cabinets on the right and left to secure these compartments above the dishwasher. Because for the dishwasher, a proper niche needs to be created so that it can be taken out again without dismantling the cabinets in case of repair. And, the dishwasher itself is already 60 cm wide.