...
SO... in summation if it were me, doing it all over again:
1. VPN? Yes, NORDVPN or the like that works with openvpn.
2.
Seedbox, yes.
Seedbox with root access for certain apps.
3. 6TB to start with. Seedboxes tend to allow you to grow your library and require a great
ratio - that means more files are downloaded, but you may not really want them, but you need them to prevent getting booted.
I hope this helps.
Cheers!