Personally I don’t user torrents. My preferred choice is Usenet. Still every now and then people tend to ask me how to setup docker containers and most often is how to set up a torrent client with VPN protection.
I have wrote in the past how to utilize VPN on your NAS and one method of tunneling your torrent traffic via your NAS and a VPN connection is using a VDSM instance that will be protected with a VPN and in return any other app running under that VDSM instance will be protected as well.
Now this is useful if you will be using that same instance for more then just torrenting. If you are looking for occasional torrent download, then maybe a docker container will be far less resource demanding, not to mention that you will not need a VDSM license (unless you have the free license still open to use).