I'm familiar with grounding boxes and I'm a believer in their positive results. My observation of using the Acoustic Revive RGC-24 on a component is this; your streamer has an earth ground via the ground buss in the service panel. Now, it has an added ground from the RGC-24. There could be a difference in impedance between these two grounds. Grounding boxes typically plug into the AC receptacle which will result in a common ground with your other components. I don't understand how using 2 different grounds is beneficial.
And now a question, how did you decide which component to add this ground to?