I'm not sure how good these are but I've never seen them this cheap, I don't think they'd be worth the RRP at $100-$120 but for $15 I'll take the risk. They are just mods that add rear buttons to your Xbox one or PS4 controllers, the downside is they need to be used wired.
PS4
https://www.ebgames.co.nz/product/ps4/245781-collective-mind…
Xbox one
https://www.ebgames.co.nz/product/xbox-one/245780-collective…
PS4 eliminator version
https://www.ebgames.co.nz/product/ps4/272854-collective-mind…
Xbox one eliminator version
https://www.ebgames.co.nz/product/xbox-one/272853-collective…
Any chance these work with a ps5 controller?