They look like these from Amazon and a cargo net.
i actually just bought a set of screw in cargo net mount points and then a generic net on amazon. :) def a good investment that cost prob about $20 max. this fit my 2020 JCW Countryman's boot.
Cargo net mounting points: https://www.amazon.com/dp/B06XV5KW39
Cargo net setup i bought (only used the net actually): https://www.amazon.com/gp/product/B015KN65UK/