Bluetooth feed for multiple Total PA Max units (without linking speakers with a cable?)

Do the speakers have to be connected by an XLR cable for them to both work via Bluetooth, or could i have both connect to Bluetooth simultaneously without a cable? That would be preferable (i.e. have one indoor, one outdoor, both sync'ed to my phone without a cable connecting the speakers...) - there is a thread along these lines already, but I am looking for specific clarity about making Bluetooth work with multiple speakers without physically linking the speakers (I know UE Booms do this...hope the ION's could as well...)
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