I've no direct experience with this particular fan, but air circulation inside the frig does help.
The best combination is "internal" fans & "external" fans. The external fans mount on the backside of the frig unit at the bottom & top accessing the area from the outside of the coach. A set of fans at the bottom area to draw air in & a fan at the top vent to pull air out.
Although not as glamorous, this is what I have installed inside my frig @ a cost of $20. If you have a large frig, just install two units if desired, but probably not necessary. These are self grounding & a very simple installation.
This company also has the external fan set-up. If you tell them what make & model frig you have , they can give you the best direction.
Refrigerator Fan