Is there any way you can take a look from above the fridge through the roof vent? If you can get at the back of the fridge and run the wire down to the lower access panel, you should be on your way to getting it done.
I use some stiff wire to fish wires into difficult areas. Just run the fish wire up, and then tape your meter wires to it. Then pull them back down.
Once you are behind the fridge, you probably can get the rest done easily.
Happy Glamping, Norman & Elna. 2008 Winnebago Adventurer 38J, W24, dozens of small thirsty ponies. Retired after 40 years wrenching on trucks! 2010 Ford Ranger toad with bicycles or KLR 650 in the back. Easy to spot an RVer, they always walk around with a screwdriver or wrench in one hand!