These are 3 slides.
Yes, it's compatible, see: https://www.modesdemploi.fr/siemens...

There are 3 slides, one for each side as in the photo.
For compatibility, you need to go to the Siemens website and look at the reference number of the accessories available for your oven model.

Hello,
there were 2 slide rails and they fit our Siemens oven. I also checked the compatibility.
Greetings

Hello,
There are 3 slides, but I don't know about your oven. I installed them on the HB675GBS1 model.

I have installed them in an HS736G3B1. It fits. I am also satisfied

You get exactly what is shown in the picture - i.e. 2 x 3 slide rails. I have it for my HB634GBS1 oven and am very happy with it.