There are vent covers out there that use the existing vent mounting bolts for installation. Some like Maxx Air can use a bracket mounted to the vent frame to secure the vent cover.
With the options available I wouldn't dream of screwing through the rubber roof.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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