Netflix for how many devices?

I would like to buy soon netflix… If I conclude the abo for a device, I can then always log off the phone and register, for example, at the playstation or on the laptop?
or can I log in even at the same time everywhere and the variant for more devices is intended only for families with different accounts?

Depending on the subscription you can register up to 4 devices at the same time.
If you only have one for 1 device, then at a time x only Netflix can be used on 1 device.

However, you do not always have to log out manually, it should be enough to become active with the new device, then the session of the other one is "frozen".

You can log in with everything, but you can only use one of them at a time.
So you can't look at the Playstation AND your phone at the same time.

That is, you can only look at one device at a time. Can you do that on the iPhone? No one at home on the TV. For example.

Then the other's session is "frozen"

Unfortunately not. If you want to watch a movie, you might just get the message "At the moment too many users are active". Then you have to make sure that the film stops on the other device.

Yes ok, if you have a stream running in parallel, then of course it will not work.