On my Regal and my Ram 1500,I blocked them from behind.I don't know if it's any more or less efficient that way,but like you I wanted to keep it invisible.I removed the grille,cut a piece of scrap sheetmetal to fit around all of the mounting points,drilled some holes, and stuck it in. I positioned the mounting screws to go through the grille,then through the block off ,then into the original holes . It kind of makes a grille-sheetmetal-hood sandwich. I might also note that I painted both sides with flat black paint to hide it and to prevent rust.The one I made for the 2004 Ram was made from plexiglass instead.I painted both sides on it too and it is equally invisible.
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