There are so many ways to store a pleo, and I do like to store them in the box to protect them, but the truth is I also like to display them in the outfits I have made them and outfits I have gotten as gifts or won. I also have way too many Pleos to all have them be displayed, and with nine cats in the house, there is allways the possibility a cat may jump on a shelf, and knock one over... :(so my solution is to display the ones I use the most and put the rest in their boxes to protect them, I also have their names written on a piece of paper on the box and or if it is a pleo displayed, I write their name and put empty box, I try to keep everything original, I only have a few with no boxes, With a total of 25, I have about 12 currently out. As you said, you need to pick a spot that does not get direct sunlight or too much heat, not too much moisture either, I also fiind a spot big enough, in my case my husband built a huge shelf that goes from the floor to the ceiling, about 10 feet high by 8 feet long and 3 feet "deep",
Here are three different photos that show my Pleos, there are many more, but this will give you the idea. If I had only three or four, I would just display them in a special spot..
Good luck on finding what works for you, RWM and the Pleo Township of the Redwoods