Would this one work?

I kept my outside vent for a reason. The hatch you've indicated would probably work but IMO, unnecessary and unduly expensive. Simply keep the vent you have. I used Gorilla Tape to seal off the "vents" and kept the vent to be able to change the water filter from the outside. It also allows me to inspect the rear of the fridge if necessary. I bolted the fridge in place once I installed it and I do check the tightness of those bolts during my annual rig checkup....Dennis