as for the rclone cache, many rcloners so not use it.
when at home, with 1Gbps internet, i do not need the cache.
as my emby server is hosted in the cloud, i run rclone mount on that.
really, it just depends on the amount of space, if any, you want to give rclone.
and how long you want stale files to stay in the cache.
choose the values that work for you.
and might take a read of this topic and compare your command to that.
https://forum.rclone.org/t/finding-the-best-possible-setup-for-plex-rclone-google-drive-windows-server-2016-with-generate-intro-markers-generate-thumbnail-video-previews/34363