Learned this when I was in the CG on a ship without a lot of space. Bought 4 travel toothbrush holders, put the soft side of velcro on the holder, and the rough side on the wall, take off when you need to use the travel holder. You don't have to worry about it falling while driving either! Our toothbrushes don't fit in the mount that came with the trailer, so we never mounted it.
I like this idea for our travel trailer fridge. I think keeping vegetables in one basket and meats in the other should help keep everything organized while still leaving room for ice trays and bin. Maybe a basket a little taller would maximize space.