Hello guys
Thank you for your tips!
I ordered this splitter:
And, finally:
Please, if you are in same conditions, note that you must buy a splitter that can “copy” the best resolution (4k HDR) to the second hdmi connected to the amplifier.
Otherwise, both the output are in the lowest resolution (in my case, 1080)
If you have questions or curiosity, don’t hesitate to ask.
Best regards