Excellent! Some people have placed fans at the lower vent to draw cool air in which in theory would push the warm air out. This is very good when you have a roof mounted vent, straight path of flow. I had an RV with a roof vent and placed the fans there. I attached pictures. Also, I closed up dead air space that was trapping hot air and not allowing the hot air to escape.
People complain about the temp in the fridge mounted in the slide; the exhaust vent is now on the side. Hot air rises and does not corner well. Rockwood installed a fan in the middle of the unit to help aide in air flow. You can read posts that people have written about the humming sound from their fridge. I called Rockwood and they told me about this situation. I would have mounted an additional fan at the intake vent to pull air in as you have done. But, Rockwood already installed one for me; therefore, I only installed the top fans to aide in removing the hot air.
The slide mounted fridge has the draw back of the hot air sitting at the top, between the fridge and the roof wanting to go up. The trapped hot air needs help corning to getting out.