In my case the side opposite to flue came naturally.
The fridge is closer to the rear end. Flue is on the "right" - when looking into the hatch from outside - i.e. closer to the rear. Batteries are in front :)
Again, the cable exits out through the sidewall of the cabinet shortly after it enters the roof vent, so the flue is far away.
Routing the cable into the vent coaming, downwards and into the sidewall, and attaching the strain relief on the vent coaming WITHOUT removing the mesh on the vent - was a lot of pain. Had to cut the mesh a few inches, to get my fingers onto the strain relief nut inside the vent.
