Hi Dave with the greatest respect , If u put fcu's above counter tops it will make the look of your kitchen accessory cluttered for want of a better word & will look totaly naff . Dont do it . The chances of fuses going minimal / Going away so switchin them off Why ? / With respect your over thinking the worst case senario . What if the RCD trip when your away ? Do you have Tropical fish ? hint hint . If you have washer /dishwasher on over night stagger the start times man ! . In reality having an evenly distrabuted load on a ring main is not that realistic in any situation .