Is going dual transcoding GPU a bad idea? iGPU+ARC

After reading some of the discussions here, is having Intel iGPU and a dedicated Intel ARC a bad ideal for transcoding in Plex and other dockers? I heard unraid will sometimes get confused which one to use?

Been thinking about getting an Intel 12th series and pairing it with an Intel ARC. Machine going to be mainly Plex and transcoding for video files and stuff. Any recommendations?