This can be plugged into the router or the streamer. My guess is it would be better plugged into the router if you have a well shielded ethernet cable.
Here we go again, commenting without a clue, neither tried it nor took enough time to research predetermined opinions thoroughly. I kindly suggest you sh** up.
I don‘t think you know enough about network specifics in an audio setting and hence I suggest you read up on ground level as well as RMI/EFI borne noise travelling along the bits. Or benefits of galvanic isolation. Or even better: try it out. Over and out.
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