When I was a PJ...
I used to keep my products + hair appliances in a china cabinet that my aunt was going to give to the free store. I stored it in the basement, out of site, because I didn't want to get talked about. Anyway, I kept my flat iron, dryer, caruso rollers, etc. on the bottom shelf, because it was the largest space; I kept the frequently used products on the top 2 - 3 shelves, because it was glass and the products could be easily spotted. I kept samples, and other small items, like hair pins in the drawer section.
Today...
I have a section under my bathroom sink for my 2 shampoos, 3 conditioners, jojoba oil, and Sabino Moisture Block, flat iron, caruso rollers, and I keep my hooded dryer on the top shelf in my bathroom closet.