I'm redoing my kitchen with Ikea Sektion cabinets

I'd like to have as large of an overhang as possible. There will be a pantry cabinet next to the double oven and then a 30" wall and base cabinet. I want the counter to then spread out to a length of around 60 or 70" (the 30" above the cabinet is in this figure), the wall ends at the 30" cabinet.

I can add a 24" cabinet underneath for support, but I can't attach a cabinet to the floor (radiant heat in the floor), I could add a half wall back (where it once was, we took it out a long time ago) but was hoping to keep it open and airy as much as possible.

What exists today:

15" tall pantry

then Double oven

the 30" wall and base cabinet with 30" counter

The cabinets will be changed to Ikea and the quartz counter top spreads out