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Earth issue when adding a second VE.bus system using mk3 USB?

I intend to add a second ve.bus system to a venus GX, using an mk3 usb interface. The purpose is to be able to get information from this second system using the modbus protocol, I make my own dashboard.

I'm now wondering about potential earth issues. I read that the USB connection is not isolated. Is the mk3 USB interface isolated? Or is the VE.bus interface isolated on the side of the multiplus? Otherwise I would be connecting the minus of the two battery banks through the VE.bus cable and Venus power supply cable, or am I missing something?

Venus GX - VGX
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