Just starting out. I have a main account with 6 120's and 4 new accounts with just one max level character (demon hunter at 120 on each).

Looking for suggestions on how other players set up the accounts with tanks, healers and dps.

I plan on just doing pve dungeons, daily quests and transmog, no pvp.

Would an ideal setup be to have one account only have tanks, one account only have healers and lastly the other 3 accounts have dps?
Or is more efficient to have multiple of the same class on multiple accounts, like one paladin on two accounts, one druid on two accounts for Tank/heal/dps options?