The current nvidia drivers work fine with this. But be sure to read the notes when installing. You will need to stop and then start the docker service after the nvidia installer finishes. This allows docker to be able to use the gpu with the UUID of your card. Also, when configuring plex, be sure to open the advanced view in the top right corner when creating the container. In the extra parameters section, be sure to add "--runtime=nvidia" as shown in the first screenshot.
Lastly, make sure you pass the extra variables in the plex container as well, or any other container you wish to use the gpu with. These are shown in the second screenshot. The variable names are NVIDIA_DRIVER_CAPABILITIES and NVIDIA_VISIBLE_DEVICES. The last variable is where you will copy the UUID in the nvidia driver module.
If you run into any problems, just let me know.