I stuff a lot of stuff between the rear seats and the start of my fall down third row. I have a tow hitch and a tire air compressor and poncho and first aid kit all wadded up down there.
I’ve been on the hunt for summer padded packs or modules of some kind that could fit under the front seats just to have more control over loose items. It’s tough though with how tight everything is for sure
That photo the OP posted is maddening because WeatherTech has it show up in Google searches as available and then you go to their site and of course not available for our vehicle so it’s just Clickbait