I bought the Weathertech cargo liner that covers from behind the 2nd row all the way to the lift gate (3rd row stowed). Nice quality, decent fit. It has a 'hinge' molded in where the cargo area floor bends/slopes down so the liner lays pretty flat on both surfaces. It does not cover the cargo area hold down tracks (which I like because I use the hold downs all the time).
I have done the same as raylepper the one additional piece I added to the cargo mat is the fabric/vinyl protector that roles out and covers the tail gate portion as well. Protect the trim on the cargo door.
I've been happy with the 3Dmaxpider ones. They sell options to cover entire back of vehicle with 2nd and 3rd rows down and allows for individual folding of seats.
I just bought the Weathertech one for my 2025 R1S. In my opinion, it uses high quality materials, but I am not a fan of how it fits over the recessed cargo area. It is what it is, I haven't found one that does it well yet.