Here's pics from the interior. Upon closer inspection, there seems to be a bracket screwed to the floor too. Only one, though.
First pic is the kitchen area. The cabinet with the wires is the lowest one under the fridge.
Closer inspection.
Cabinet interior.
The ends of the wires are flattened. These two wire break away from the wire loom at the top of the cabinet, not the loom entering the floor.
Any ideas, folks?