Coolant leak

That is going to be hard to armchair, honestly. Most likely, what is happening is that it is leaking from somewhere above that and it is running down some part or another and falling onto the pieces that you describe. The pieces that you describe sound like skid plates (their job is just to protect your mechanical's from debris on the ground).

The best way to diagnose a cooling system leak is with pressure tester. You can borrow one with a deposit from some local parts stores (namely AutoZone, Advance Auto, and O'Reilly Auto Parts). When the engine is cold, open the hood. Take the radiator cap off. Connect the pressure tester to the radiator using the necessary adapter (comes with the tester). Pump up the pressure (like a bicycle pump). Then just look and listen for the leak. It should be fairly obvious.

Here is a more descriptive guide: https://www.2carpros.com/articles/radiator-pressure-test

Also, are you sure that it is coolant leaking, and not just water? Water could be condensation dripping off of the air conditioning system and running down onto the skid plates (or whatever the part is that you are describing).

Also, do not pump too much pressure in. The radiator cap should have a pressure rating on it that applies to the cooling system. If it doesn't, then 15psi is a good safe number. It will be enough to show a leak, but will not damage anything.

Also, the image below is a decent illustration of a cooling system tester.

Please let us know what happens so it will help others.

Cheers, Ken