Those dimples should be the smooth heads of the carriage bolts that go through the bracket and then through the base flange of the MaxxAir vent itself. Mine is much the same.
I don't think there is enough movement between the bracket and the membrane to worry about it rubbing through.
I suppose it would be possible to slide a bit of rubber gasket material between the membrane and the bolt head if you felt there was any chance of a rub.
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'12 F250 4x4 Super Duty PowerStroke 6.7 diesel
2011 to present: '11 Cougar 326MKS
1999 to 2011: '99 Sunline T-2453
SUN264 * Amateur Radio kd2iat monitoring 146.52
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