I ran the sPod wiring through that when I put it in this week. You have to use it as the connector wont fit through the other hole. I pulled the grommet out & ran a straightened coat hangar with a hook bent into the end through, into the footwell. Then taped the connector to the hook & pulled it through.
Slit the grommet so the cable can get into the center of it, then reinsert grommet. I had the compressor switch & power for the fridge sockets in the back running through the other hole, but now, just the power as I connected the compressor to the sPod.
I'm tidying up the wiring to the battery while I'm at it. Main problem is that there is not RHD bracket for the sPod Source, so I currently have it stuck onto the top of the fuse box with sticky backed velcro!