Ultra Rendu replaced by the deluxe , which is much better $499 , use one on both ends ,for best sound
the 9 v Ifi audio noise cancelling power supplies for $70 each as good as many midfield Linear power supplies with their noise cancelling technologies
plenty good for this application , on routers which suck up current
small green computer has decent high current 12 v models
and for a server buy a good one find out the voltage land. Most important the current draw you want more then then max on the server !