Some googling revealed the Canvasback: https://www.canvasback.com/mazda-cx-30-cargo-liners.html

I've also seen this on Amazon. https://www.amazon.com/OkuTech-Coverage-Weather-Waterproof-Stitching/dp/B08F3TNN44

I have no experience with these, but it seems like there are options out there. Personally I just use Harbor Freight moving blankets if I have to haul a bunch of stuff with the seats folded.