Thing is, most allocators 'VPNs' actually generate a 'Private Key' for you, and I have not found anywhere that is able to be inputted in DD-WRT. This is what made me switch to OpenWRT for my WireGuard protocol side of the house.
Also, I am not sure why there is an area to input Peer Tunnel IP when from the 4 VPN providers who support WireGuard, they do not provide this whatsoever.