The model number is normally found inside the fridge or freezer. You will likely need to remove the salad drawer or freezer drawer to find the model number plate. Otherwise the model number is likely to be on the side or rear of the appliance.
The Bosch KGN33/KGN34 Series Door Shelf Milk Bottle Rack Tray Fridge/Freezer GEN would be an excellent choice for people who need a compact, durable, and easy-to-clean shelf tray to store milk bottles in their fridge or freezer.