I've some work to do to fit integrated fridge freezer doors (the kind where the appliance door has its own hinges and the furniture door has separate ones). Do I actually need cup holes? There are hinges that just screw on to the face of the door, so I wonder if I can use these? Are they adjustable, is that the drawback? Strong enough? I guess people wouldn't drill cup holes if they didn't have to. OTOH, doors to rooms as opposed to kitchen cabinets, don't have cup holes! Any advice please? TIA, Terry