In this video I install the Amazon cargo mat:
"powoq Fit 20102023 Toyota 4Runner Cargo Mat Back Seat Protector TPE Trunk Mat Backrest Mat for 20102023 Toyota 4Runner 5 Seater Accessories (Rear Backrest Mats+Rear Trunk Mat, Fit W/O Sliding Tray)"
Unaffiliated link:
https://a.co/d/2yi97rV