FS - It can be fairly easy if you order a LPS supply from one of the small vendors. You can request that they connect the earth ground from the power IEC to the DC common that is on circuit board and the DC connector.
If you have a 2-prong plug on your supply, like a Sbooster, then you may have to make a 4-foot wire with a banana plug on one end and the other end must connect to the "ring" on the DC connector. You can connect this usually by removing with a knife a short length of the insulation on the DC cord and then solder to the shield. The banana plug can go into the ground hole of an outlet.
BTW, what is happening here is the leakage that usually occurs across the Ethernet interface transformer is reduced significantly, resulting in better SQ.
Steve N.
Empirical Audio