Razer Huntsman Tournament Edition ISO Layout problem

Hi fellas!
I bought this keyboard few days ago to try something more international instead of the Italian layout I always use. It's in ISO layout but there's something weird, cause the key on the left of enter should be \\ and | using a US ISO, and in this model the key sayus # and ~.
Switching layout from Windows inputs to English the 2 alternative changes, so it seems that's a merge between an ISO US and an ISO ENG.

I don't know which layout I have to use to match perfectly the layout of my keyboard (leaving my accents was already a trauma but I'm getting use to it).

Am I doing something wrong?