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It wasn't long ago I looked into this and after reading many posts here and in other 997 forums, I decided to vent. Much like Carrera Mike, i cut holes in the bottom of my bumper. I used his photo and scaled it best I could. It was very easy. I added some screen to cover the holes by cutting the screen pieces larger than the opening and epoxying the screens to the bumper. A pic is attached. I would imagine that without the venting the frunk would get hot. With the venting, I didn't see any increase in temperature in the frunk area. I think it is needed.
The view is looking down, with the front of the bumper at the top of the pic. you can see the radiator openings at top with the same grill / mesh material attached there too.