In my RR V-Core 3, I positioned mains-powered components in the lower part. While Wago 221 connectors are quite well protected against accidental touch, it is not the case of the power supply and the solid state relay. I have therefore designed a shield mounted onto 3030 extrusions with M5 or M6x12 and drop-in nuts.
FreeCAD sources included.
Use the design at your own risk.
The author hasn't provided the model origin yet.