Most cases for rpi are $3 plastic shells around the board. With a stiff cat6 cable you can’t even make it sit on a flat surface but it will hover above your shelf (good for cooling but feels a bit flimsy). That’s what my closet looks like now. Tiny boxes suspended by their tangle of cables. Disconnecting one always feels like a risk of disturbing another.

Just a bigger/heavier case, or one with good wall mounts, or a half with rack tray where you can bolt one (or more) raspberries would be perfect to get some order in the closet. Googling around now I see a lot of DIY rack mount (stacked vertically in 2U seems to be the popular choice). Just need to find someone selling that commercially.

Using iDevice chargers are a good idea.

Edit: googling further reveals this one too: https://revolution.kunbus.com/revolution-pi-series/ DIN Rails! Situation has definitely improved a LOT and shows that there really is a demand for more "industrial" use.