This DIN rail mount (for standard 35 mm rails) for the Shelly Plus 1 includes snap-in slots for WAGO 221 connectors - either 3 or 5 wire version. It  also fits the Shelly Plus 1 PM (Shelly Plus i4 is 1 mm taller according to data sheet).

Handy and compact solution with clean wiring options. I use it for multiple inputs in a push button setup.

Let me know in the comments how you like the design and feel free to suggest improvements. Also share your prints :).