The multi-device licences are CCleaner Pro Plus (3-devices) and CCleaner Premium (5-devices).
Included devices are any mix of PC, Mac, and Android.
Note- At the moment that does not include iOS devices.
Because of Apple licencing restrictions CCleaner for iOS can only currently be purchased through the Apple store.
It is not covered by a CCleaner multi-device licence.
(That may change in future, CCleaner Android used to Play Store only, but negotiations later enabled it to be added to the multi-device licences).