I bought a cargo net trunk organizer from Amazon. Did quite a bit of research on the size and length to fit the 4.5 Rav4 and this one is nearly a perfect fit. The top hooks latch to the seat back latch and the bottom ones connect to the loops.
https://www.amazon.com/gp/product/B075P2LYGV/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1