said by mozerd: ...assign it statically ...
 
As I understand it, unless purchased otherwise, all the DHCP (IPv4 and IPv6) address for residential users from Comcast are dynamic IP addresses.
So static vs dynamic allocation is not an IPv6 thing for home networks.
What I do, however. is take the IPv6 /64 prefix and assign /128 IPv6 addresses to devices on my home network based upon that /64 prefix.
For example, I have a FreeBSD box. In the rc.conf of that box, I take the /64 prefix and fill out the remaining 64 bits. That FreeBSD box does not use DHCP or SLAAC, the IPv6 addresse and router are in the rc.conf file.
If I needed, I could also use the host reservation feature of DHCP and assign the IPv6 addresses in that manner.
Aside from that, I am not sure I understand what you mean by "assign it statically."