I think fluid motion of AMD failed to take off ... so not many things that support it out there ... and since it failed to take off, not much have been updated by AMD probably
Fluid Motion is just another gimmick marketing for frame interpolation ... MC can do that via MadVR (Red October HQ video mode) ... and MadVR is probably one of the best post processing for video (need good GPU power though)
I never use frame interpolation on 23.97hz movies ... interpolating them to 60hz make them look too real like TV soap operas ... there is reason why movies are shot 23.97 ... well originally probably to save cost of making them ... but as side effect you get dream like effect (motion blur) that make them look unreal, so your mind don’t question if it’s real and accept it as it is ... that’s why movies are still shot at 23.97 (if 60hz gave better experience ... they would be shooting movies at 60hz by now)