Unfortunately there is no support of Xim 4 or Xim Apex for "Hunt Showdown" it was before, but devs removed it cause, each update Crytek change aiming settings, and community of game not so big, thats why i think XIM devs gave up. There is way to play using DayZ profile, but it anyway nothing even close to experience like you will get with normal game supported by Xim.
So buy especially for Hunt, its not good idea.
Regarding support of your controller, now Hunt still is backwards compatible with PS5, so you can use PS4 controller for it, if you want use Xim for other game which made for PS5 you will need get, beta firmware for Xim + Supported 3rd party controllers which is mentioned in 3