That's a fair point. I had a set of weathertech in my last car and was very impressed with the depth/height of the tub. That said, I still wound up with debris below the liner so I'm not sure how much is failproof. If you move forward with the aftermarket liners please let me know how they do!
The rubber mats/liners that came with the Tremor package seem solid so far; I'm up in NH so they've already seen some snow and seem to have done really well keeping it all contained. Granted, I haven't tested the back ones at all I don't think so they might be a weak spot, but I can't say for sure.