Unfortunately, I had to distinguish the types with ordering difficulties! - Maybe that helps below listed contribution other interested parties in their decision if they have similar problems as me.
The "Allocacoc Powercube Rewirable, Original Type F / C, 5 outputs, 10A / 230V, magenta" is delivered with a grounded plug (and not "" power cable ").
The "Allocacoc 17943 PowerCube ReWirable power adapter (5 times, safety plug)" comes with NO safety plug. (And also any "" power cable ").
Both PowerCube types can be operated with a "power cord" or one of the Schuko plug "essays" (Allocacoc 18012 ReWirable Reisestecker for DE / FR / UK / US / AUS).