The separation filter must be as drawn- separate the 2 wires and connection points.
The drawing just has then close together but they are separate and do not physically need to be right next to each other.
Capacitors block DC, and further, can pass AC but becomes frequency specific- hence blocks 60HZ and yet passes the much higher DCS data packets frequency.
Since all the commander is doing is powering the internal electronics- you can use the Z750 Brick, or you can use a much smaller and possibly DC style wall wart of maybe 1A rating.
