You would definitely want to daisy-chain your RAF invites. I did mine all from one account a while back and that meant that the level grant thing only worked on the main account, meaning I had a ton of granted levels and nothing to spend 'em on. Not sure if it still works that way.
https://us.battle.net/support/en/art...cruit-a-friend for more details.
[edit] Also, there is a "Merge a World of Warcraft account" link on the right side of the battle.net account management page. That's how I rolled the rest of mine into my main.
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