Z9S shipping is by Royal Mail International Tracked&Signed. Total time to Germany approx 3-4 working days, sometimes faster.
This is different to Z10/X20/X20 Pro where we use UPS and total time would be 2-3 working days.
There are no customs fees etc because we are shipping from the UK and we are still in the European Union (and I hope it remains that way).
The standard PSU we ship for Z9S is Europlug type, so suitable for Germany.