ARozghon
ARozghon
looks like is Outdated
Hi! did you try the latest master 3.4.0 with the latest Blender 2.93 LTS? link to release 3.4.0: https://github.com/GPUOpen-LibrariesAndSDKs/RadeonProRenderBlenderAddon/releases/tag/v3.4.0
thank you for the scene and details
Emissive working with the latest master, but multi-materials not support by interactive mode 
multi-materials setup   and with separate by material 
sorry, not the latest master, latest develop biuld
RPR supports all types of licenses for Houdini, including Non-Commercial and Indie. Please, try the latest build
Material X DIsplacement is not supported yet, now it's under development
hi, from which shop was installed Blender: Steam, Microsoft, or Blender official site?