A what? undersink mat for leaks? Nahhh you don't need that!

If you're really concerned, you can put a water alarm under there.

Thanks, I'll look into a water alarm.

I have plumbing coming through the bottom of my sink cabinet as well in my soon to be completed kitchen. I've been searching the internet for something to protect the nice new bottom of the cabinet and the only product that I found that can be adapted is this one from Rev a Shelf. The material is pliable enough to be able to cut a slit and a hole where the pipes come through. Because it will slits and holes cut through it won't hold a bunch of water, but at the very least it will help with an occasional drip or wet bottoms of cleaning products and sponges stored in the cabinet. https://www.amazon.com/dp/B00H46N2NA/ref=asc_df_B00H46N2NA5076729/?tag=hyprod-20&creative=394997&creativeASIN=B00H46N2NA&linkCode=df0&hvadid=167135146302&hvpos=1o5&hvnetw=g&hvrand=16648340664881781311&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9007767&hvtargid=pla-275506679217

I had a kitchen once with pink vinyl flooring (with sparkle in it) that was also used in the sink cabinet. You could use something like that and caulk the seams.

My previous kitchen had harvest gold sheet vinyl. Worked like a charm. And was a blast of unexpected eyebleeding sunshine when you opened the door.