Question about hamax Caress

Yes, you can see it in the photo. It also locks (anti-theft).

Correct, both answers below are correct.
With my carrier, I was able to attach it directly to the carrier using the tightening wheel of the seat without an adapter.
The child seat has held up perfectly and has done its job optimally for 2-3 years and my son sat very comfortably and safely on it!

The seat is attached to an adapter (normally included in the scope of delivery). This is clamped onto the luggage carrier and can be locked.