Screens on the front of the grill will let leaves and debris fall off easily, or be washed off by rain. A screen placed inside of the grill can allow leaved and debris to get packed in the grill and trapped. The Telluride does not have a very deep grill, so this is not as bad of a possibility as with some cars. There is also much open area above, but I still need to be cautious recommending where these are installed.