6 channel line out with one common ground?

This might suit my needs for a build and it has a pin connector which would make wiring to amplifiers easier. It only has one ground for all channels though. Is this good design practice or asking for crosstalk and or noise? I notice common L/R grounding on the inputs to some of my amplifier boards so maybe common practice?

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If this post gets any traffic I’m wondering if three pin phoenix type screw terminal connectors can be found but with the staggered pins like the pins connecting the rca jacks? I could swap those connectors and make wiring easier, I think. What might those connectors be called if available?
 
I kind of botched the description here, I must have been preoccupied or something. I should have said that the connector only has one negative for all six channels. This is more concerning to me as I wonder if the single negative layout is mirrored in the rca connectors.


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