Not a Saturn owner but I was told by the place that sold mine it could be installed behind the grill if there was not room in the engine compartment. Then there is this from the installation instructions;
"The unit can often be installed behind the grill provided it doesn’t restrict air flow to the radiator. Moisture will not harm the unit, but it should not be in the direct path of rainwater or road spray"
I was lucky I found a place in the engine compartment to wedge mine in and use tie wraps to hold it in place.
Brian, Loretta & Daisy (Golden Retriever)
2008 Holiday Rambler Endeavor 40 PDQ , ISL 400
2014 Ford Explorer toad