Two pieces of sawn 25 x 37. Nail or screw to wall one close to floor, the other a few inches higher. On top of the upper one, nail or glue a piece of moulding in your choice of design. Slap on a piece of hardboard/thin MDF/ply so that its upper edge is under the moulding. Gap between the sawn pieces gives room for cables.
I certainly CBA to rout metres of skirting.