can i use a virtuoso plan on different devices

I have several volumio devices and a single virtuoso account.
Can i select which device gets the virtuoso access or is it fixed on the one device?
In myvolumio UI I see “delete” device. Not sure what that does, but my other devices do not appear there. (like i would expect)
It would be nice to switch the virtuoso subscription between my devices is this possible or am I forced to buy the
pricey superstar service?

just login from every device to myvolumio.
in myvolumio you can manage all your devices (this is unlimited)
you can enable/disable and delete devices. with virtuoso you can enable one device, with superstar six.