ok, convinced, @alexpescaru 
Multi RS Solar 48/6000/100-450/100 is ordered. Will deliver feedback after setup and test.
Just realized, some parameters are slightly different from a MultiPlus II setup. Some settings match, Sometimes different parameter designations are used and some parameters exist for a MultiPlus but not for Multi RS and vice versa.
Opened a new topic for configuring a Multi RS 6000 in a DESS scenario with Pylontech US5000 connected to German grid.