This is what I have built up over the years beginning with my 8GB iPhone 2G to my current 17 Pro.
Top shelf contains my legacy iPhones (centered) with my Pro series flanking on either side.
Second shelf contains the entire 13 mini lineup across all storage tiers in every available color with the three sealed never opened examples in the back center (Midnight 512GB, Blue 256GB, and Green 128GB).
The third shelf contains all the 12 minis I have begun collecting starting off with my 256GB tier (Blue, Purple, Green) and my Product (Red) arriving tomorrow. I have been collecting the MagSafe accessories for both the 12 minis and 13 minis with boxes being stored on the bottom shelf.
I do cycle thru some of these iPhones in my collection and enjoy using them when I do. 😎👌🏽 I have been enjoying the many options I now have as a result of building this collection.
EDIT: since this posting I have added the White 256GB 12 mini and Purple 64GB 12 mini to this part of my iPhone collection. At this point I'm going for the entire 256GB tier so that leaves the Black 256GB 12 mini to get before completing this storage tier for my collection. I have also begun working on collecting both the Blue (hero color) and Purple (refresh color) in full storage tiers for both these color 12 minis (256GB, 128GB and 64GB) to add to this part of my iPhone collection. Yes I am having a lot of fun doing this and love how my collection have been coming along. Not many collections have this complete "mini" history as mine does.
