Is This Supposed to Have a Screw Inserted?

When reinstalling the L shaped undertray on the bottom of my 996 Turbo (cabriolet), I initially thought this section should have one of the screws in it (I had taken off all of the undertrays, so I had multiple screws in the bin for reinstall). Now, I don't think that is true. Can somebody please confirm this, and if correct, please explain why this piece has this hole? There are other nylon nuts nearby, so the piece is well-secured but why is this little extension of the undertray even there if it isn't for securing? I am afraid I opened up a cavity that may now need to be sealed against water intrusion and rust because when I attempted to put a screw in it felt like it pushed through some foam and the foam seemed to push upward slightly yet then there was nothing to grab/hold the threads of the screw. This is not the drain for the cabriolet top, correct? I certainly don't want to seal that up. Here are some pictures to explain and orient things. This is found on the driver's side of the car. There should be four graphics/pictures below: Overview shot looking from the front of the car toward the back: Closeup of the area circled in the previous picture: Closeup of the hole. You can see the foam up behind the hole if you look closely: Area in question on the tray part highlighted in yellow. Remember this orientation shows from looking downward from above while my pictures are shot from below. Thanks in advance for any help.

At one point there was a stud there that seized and twisted off in the plastic nut that held the panel. Same thing happened on my Panamera.

Thanks for the reply. It amazes me to think the nylon nut might have had enough torque to rip a stud out but if it was impact damage you would think you would see damage to the fastening point on the tray. Those nylon nuts seem to self destruct if you do the slightest over-torquing. Oh well, we will just deal with it. Thanks again.

The sheet metal corrodes around the stud as the soot from the (spot) welded studs prevents the e-coat, applied during manufacturing of the body-in-white, to adhere properly. Studs themselves corrode too, get thicker and the required torque to undo the plastic nuts is high enough to shear the whole thing off, leaving a hole as in your picture. The repair is by means of a 'rivet-stud', available at porsche, I believe.

The nylon nuts are installed by mechanics using impact 1/4 drivers ... all the time, and they rip out the studs off the car just like that. It is a poor design.

Advice, when removing panels, spray lubricant on nylon nuts to save the studs. If you lose a stud/nut, you can use JB weld to attach a new stud, or replacement bolt, nut. I moved into a new home and added a 4 post lift. I didn't realize that the left bottom panel ahead of rear wheel was tapping the lift ramp until, one day in a rush, I banged it hard and putting a hole in the panel and breaking off the stud. I replaced the panel, found a stud like thing (in my jar of bolts- no idea where it came from) with a the correct thread. It had a big head too. I JB welded it in place. the JB weld didn't look pretty, but once the panel was in, it cannot be seen. Surprisingly solid too.