Update: I pulled my spoiler and remounted it. I used two drilled screws as mentioned above, cut four small sections out of the gasket at the low points of the gasket to allow venting (and draining) of volume between the trunk lid and spoiler of any water that might migrate into the volume, closed the manufacturing holes in the spoiler with silicone, applied silicone around the front part of spoiler and sides, and also applied silicone around the mounting holes.
This will preclude any trapped volumes and associated pressure induced loads, vent the inside of spoiler, not allow water to get into the spoiler, try and preclude water from getting under the spoiler with the silicone in critical areas, allow water to drain if it gets under the spoiler, and also allow venting of the volume between the trunk and spoiler.
I calculated about 40 lbs of temperature induced force per bolt, with four mounting bolts, which made me want to vent all trapped volumes. The fiberglass is pretty thin where the screws go in and I didn't want to create non shear loads in the fiberglass.
Thanks to Bummer for Pm'ing me during the process of me deciding what I wanted to do on the rework.
FWIW, YMMV.
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