I have several of these vented hoods, but came to the conclusion that the best of the best 40.5mm screw-in standard hood for 50mm RF lenses is the original vintage Voigtländer 310/41 hood designed for the classic Vitessa cameras.
It is not rare and not expensive, and will protect the front lens element from oblique light rays way better than the modern Asian knock-off hoods. Plus, it's compact enough not to be seen at all in the camera viewfinder.
I like it so much that I've got three.
Absolutely highly recommended and worth the search on the auction site.
Example : item 330222701240.