I surmise these reclockers derive most of their improvements by lowering the noise floor rather than the reclocking. Servers are likely the noisiest component in streaming system, the Phoenix should be providing lower noise floor.
I too am skeptical of adding multiple clocks, clock in renderer and usb board in dacs should do the job. At one point I added audiophile switch to my streaming setup, the OXCO clock in that far superior to the relative crap one in my router. Result was by far the worst addition to my streaming in five or six years of experimenting with various streaming components.
Ed Meitner of EMM scoffs at these various add on clocks, claims they do nothing or screw up timing. He states clocks should be internal, placed closest to circuit their providing timing for. He hears lower jitter mostly as affecting sound stage at this point, most of the jitter that we hear as digititus has been decreased to the point this only impacts lower level digital. Funny thing was, the audiophile switch I added decreased sound stage size, etched image outlines, I did hear more detail. This tells me something about adding another clock in that switch, I presume mismatched or excessive clocking.
Again, optimize the usb rendering and input in dac, good to go, this best implementation of clocks.