Bluestar Double Wall Oven - Houzz Bluestar Double Wall Oven. Bluestar double oven install: (French door on top, regular oven on bottom) Top oven keeps popping out on the bottom since the oven itself sits higher than the lip so it tilts back on the lower oven roof and won't sit flush. The tops both secure with screws and it seems I would need some kind of board / frame to put in ...