I'm planning to do Recruit-A-Friend boosting with a level 80 character I already have.

Account 1: Booster with level 80
Account 2,3,4,5,: to be boosted


Should I link:

Account 1 --> Account 2 (not necessary, but won't harm right?)
Account 2 --> Account 3
Account 3 --> Account 4
Account 4 --> Account 5

thanks!