I'd go with a GTX 1060 6GB. It's recommended spec for CoD WWII. It won't get you max settings, but Ultra mode on CoD WWII last time I tried it even on a 1080 Ti would not work due to a bug in the game anyway. What I mean by that is it will play on Ultra, but crash do to a VRAM memory leak. I never got it to run more than 1 or 2 minutes at a time, so you'd be lucky to get 1 min out of a 6GB VRAM 1060. If the game won't even stay running on a GPU with 11GB VRAM, it obviously wasn't play tested well.
[video="https://www.youtube.com/watch?v=18El3YKDhQc"][/video]