I'm looking at IKEA's Frostig BCF228/64 integrated 70/30 fridgefreezer as it has auto defrost on both compartments - and a 5 year guarantee! The FF has a depth of 560mm and width of 540mm. The housing unit is 570mm wide and deep, so I'm OK on the width, but is 10mm suffient at the rear? I know I hav...