Shelf Standoff & Anchor

Bought a shelving unit from Amazon https://www.amazon.com/gp/product/B09MYWBS6J/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&th=1Didn't like the janky way they wanted it anchored to the wall. Also, with the trim and quarter round at the base of the wall, it wasn't going to be snug so needed a standoff.