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3.3v power to Digi+ Pro

I'm planning to provide a low-noise 3.3v regulated line to the D+Pro as per the knowledge base entry, but I'm wondering about the GND - I assume this shares the common ground with the 5v rail that powers the Pi/Digi+, so is there any need  to connect the ground to P5?

My choice is between powering my 3.3v LDO from the same 5v LPSU that I'm using on the Pi, or having a second 5v LPSU just to power the 3.3v reg (albeit taking mains AC from same tranformer). If I do the latter, I have two grounds in play, I'm not sure what the implication of that would be... Any ideas?

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