When the Roon Core runs if it has been previously authorise for another device it will prompt to un-authorise that other device and then it will authorise the current device. There is no limited to the number of times it can be switched.
Yes, there are many alternatives to a Nucleus; Windows PC, Apple Mac, Intel NUC (ROCK, Windows or Linux).
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What I should make clear is this is for an independent copy of your Roon Core, automatic Database synchronisation across Roon Cores is not supported. Though a backup can be restored if required.
Many user have requested “Mobile Roon” which is where a Roon Remote can access the Roon Core (say at home) from a remote location. This is on Roon’s roadmap and development has started but there is no timeframe publish (Roon don’t do this).
See …