So I found this Anker adapter that satisfies me completely. The design is confirmed to photos and small LEDs on the top of the unit are very convenient to control the activity and transfers.
Then I was really surprised by the rates of this adapter. I thought I had a small loss but not at all. I managed to reach speeds at 60 MB / s Gigabit NAS between my Mac and my. It's really very satisfactory so we're not limited to 100 Megabits because of the USB 2.0 so it's cool!
Less than 20 euros, it really is the essential accessory to have in your laptop bag!