As a side note I'd like to mention the fact most German electricians have a deep mistrust against screw connections since they say screws will always loosen as the wire flattens, even copper, worse tinned stranded copper. Most of them only accept spring-pressure connectors like Wago as they say those connectors adjust the pressure to the wire. It seems like the internal construction of those connectors is substantially better than that of the evil US backstabbed receptacles.
