I had the same problem going through the grill and originally I used 3m Velcro to hold them in place. However for more stability, I created a bracket to mount the heads on. I hope the pics are visible and clear if not I can take a few more shots of them. Name:  ImageUploadedByTapatalk1417977462.377719.jpg
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Size:  231.9 KBName:  ImageUploadedByTapatalk1417977496.255675.jpg
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