Here's something that HELPS ... won't protect 100%, but helps.

https://smile.amazon.com/Leviton-41081-4WP-Angled-QuickPort-Wallplate/dp/B003ATOCDO

When they do spill, it runs down the cable, but not into the jack itself.

Next is to put it tab up, which helps the ones with cables in.

Tab down helps the ones WITHOUT cables, so that's a 50/50 if you have unused drops.

If you're paranoid enough, there's outdoor faceplates such as https://smile.amazon.com/MM510C-Weatherproof-Outdoor-Receptacle-Protector/dp/B001JEPX4Y/

Note: Both linkes are to smile.amazon.com because I do one of the charities that, well, smile.amazon.com supports. Swap "www" for "smile" if you are concerned about that at all.

RwP