Carbon monoxide danger with pellets (storage + combustion chamber) in living spaces?

I am currently dealing with pellet heating systems and have also discovered the danger of carbon monoxide. It is clear that carbon monoxide can form in the pellet storage and burner room. In connection with this, however, I came across articles stating that carbon monoxide can even diffuse through ceilings and walls. Now the problem, or rather my question: Is the apartment on the ground floor, which is directly above the rather large pellet storage and burner room located in the basement, at risk regarding carbon monoxide?

By the way, it is a multi-family house, therefore a very large pellet storage.

Would you ask this question about a gas heating system as well?
With that, CO can also escape through a leak in the chimney.
Therefore, I would advise everyone to install a CO detector in their home or in the affected room, because yes: CO also diffuses through walls.

Best regards in brief

Is the apartment on the ground floor, which is located directly above the fairly large pellet storage and burner room in the basement, at risk regarding carbon monoxide?

Normally not. You have to ensure proper ventilation. The chimney sweep can advise you.

Would you ask this question about a gas heating system as well?
With that, CO can also escape through a leak in the chimney.
Therefore, I would advise everyone to install a CO detector in their own or the affected room, because yes: CO also diffuses through walls.

Best regards in brief

Of course I would as well, but as far as I have read, a gas burner switches off if the combustion is not optimal, precisely to avoid CO. I have not been able to find out yet whether pellet burners switch off. In the pellet storage, however, you simply cannot "switch off"... CO is produced. Sure, it is now said that a pellet storage must be well ventilated to avoid a danger from CO. But that always sounds very vague to me. More like "then it is not so bad anymore"... In the relevant articles regarding CO, they always speak of creeping/chronic CO poisoning from small quantities. Hence my uncertainty and the question about how it looks with living spaces above the storage and the heating system.
Even if the pellet storage is ventilated, obviously a problem with CO can still occur. If the CO can then get through the ceiling into the living spaces above, of course that is anything but trivial.

CO detectors in every room then? Because the storage and burner room are really beneath a large part of the apartment.

There is the heating regulation (which prescribes the ventilation openings) and the exhaust gas measurements by the chimney sweep. There are limit values for the amount of CO that may be produced. Why does CO form in the pellet storage, nothing is burning there?