See what Blizzard can see server side from your "playstyle", legally!!!:
1. Using 5 accounts per computer in the same time = 5 x Flags.
2. Using 5 accounts for 12 hours/day (usually without any break, like any human would do) = 5 x Flags.
3. Using only a single bot-friendly activity (Running dungeons) in the 90% of the online-time, while "playing" the 4 non-main accounts (Assuming you do other tasks with your main) = 4 x Flags
Conclusion:
5 accounts on single place involved in suspicious botting-like activity for 12 hours daily, 4 of them have no other activities on the account, 1 of them doing various stuff.
What to do them, what to do?