You can run StellarMate on multiple RPi's.
However, in my experience, when I logged into each EkosLive with one account for StellarMate on multiple RPi's, the StellarMate mobile app was conflicted.
I want to tie multiple licenses to an account, but there was no way implemented in Ekos to distinguish this.
I will have to check to see if this is still the case.

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