All is well
The product is exactly what I was looking for. It works very well, quietly and unobtrusively.
On the other hand, fortunately there are very clear online tutorials for installing this Synology NAS. In fact, I find it totally scandalous that the pseudo "installation guide" is just a piece of confetti that says: Plug in the 220V! The Synology site isn't any clearer, as you have to dive into the sub-paragraphs of the downloads to find the right one, but still without any explanation.
Communication isn't bad, because it's non-existent! It makes you want to rate it badly, but the end result is excellent, so I'm accommodating.