Hi Medwardo, you should look into FMC ( Fiber Optic ) for the long runs, Fiber optic cables are really really cheap and off great isolation for one and use high quality ethernet cables from router to FMC- FMC to dac of .5 meter runs. Use batteries or LPSU for the FMC to further isolate and reduce noise.
For further info on FMC check out numerous post at CA.
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