In this video I install the Amazon cargo mat:
"powoq Fit 2010-2023 Toyota 4Runner Cargo Mat Back Seat Protector TPE Trunk Mat Backrest Mat for 2010-2023 Toyota 4Runner 5 Seater Accessories (Rear Backrest Mats+Rear Trunk Mat, Fit W/O Sliding Tray)"

Unaffiliated link:

https://a.co/d/2yi97rV