Unfortunately I can’t use their product, but if I could I would in a heartbeat.
I’ve read so many good things from other people, they are very open and active on their website (https://blog.init7.net/de/) and in the networking community.
Of course 25G is an insane Speed for a residential (!) connection but having is better than needing :)
Also if you buy a 25G you will have to deal with a more advanced router, which has a 25G interface, I belive on their website they recommend Mikrotik which is nowhere near as easy to setup as Your Fritzbox or Netgear Router.
Let us know how it goess
If you use luks, you can just add dropbear to have a ssh-server running and enter your password there.