CG3000DCR questions

Prepping for my static IPv6 setup on my lan. The IPv6 setup page for the lan side of my gateway shows an address that is different than the static information that I show when looking at my account services.

Since I'm running a PFSense box, my preference is to use that to provide any dynamic info to my lan as needed, but I will also be adding several static systems (DNS, webservers, etc) and don't want my gateway to interfere with anything internally.

Is it safe to untick the "Enable DHCPv6" box? Should I set the option "Disable IPv6 Firewall" (I know it gets disabled for IPv4)?