This is a 3-port socket strip for self assembly with a Shelly Plus 2PM.
It uses sockets from PCE (10584-0wsc) with side cable entry (important!).
The incoming cable can be fixed by a strain relief which works best for 3G1,5mm².
Because there is no shelly module with 3 relais, to sockets are interconnected.
To ensure a maximum safety from eletric shocks, please put the "Schraubenabdeckung" on each mounting hole. For correct wiring please ask an electrician to avoid any electric shocks if you are not familiar with circuits on mains voltage.

There is also a 2-port socket strip available: https://www.thingiverse.com/thing:6730436

Additional parts:
3x PCE 10584-0wsc
1x Shelly Plus 2PM
2m 3G1,5mm² power cord (also for internal wiring)
2x screws 3 x 10 mm for fixing the strain relief
8x screws 3 x 15 mm for the housing