Hi Therezin,
I mounted the monitor upside-down because of the viewing angle.
This specific monitor has been designed to be looked at from above. It's actually pretty good from around 10° to 90°, but from 95° to 180°, the visibility is very bad. Therefore i had to reverse it so when i seat behind my desk, i'm in the good range.
Let me know if this explanation is not clear enough, it's pretty hard to describe in a foreign language.
Thomas