If you mainline for 8 colas, you shouldn't need to scrog them. They shouldn't need any support at all if you supercrop each branch regularly, up and down the branch-it makes them super strong. If you mainline to 16 primary bud sites, then scrogging isn't a bad idea because the branches will need some kind of support. Even if your 8 cola mainline has noodle branches, you should just need a bamboo stake for support. I like small, mobile plants-once you scrog you are locked into that space for the duration and it's a complete pita if anything goes wrong or needs treatment.