i don’t get it why people still use old protocols when better and new ports are here.
I have also setup the turris on my vpn. My VPN Provider is Purevpn and I was also trying to find the Easy GUI method to setup L2TP but I think there is no method out there to set it up in just one click. but you can set it up with this method if you are using windows operating system https://www.elastichosts.com/blog/windows-l2tpipsec-vpn-server/
Also I have been using turris on these multiple vpn servers https://www.purevpn.com/server-location of my VPN from a long time by using above method.
Well my setup is a bit different, not Windows at all 
But thanks for your suggestion.