I now have my VPS but I would like to run 5 bots on real IP and 5 others on the VPS IP¨, how can I do that ? (maybe two wow installations ? I have no idea)
As people already informed you - use VMWare, its not hard, even for non-techs.
The whole point is, you were 99% banned, because used tons of bots on single wow client simultaneously.
They do it via their Own namespace in the Windows Registry, used to link all the wow licenses, ran on single machine/wow client - and the data is compared with their behavior-based ban-flags, then ban all the linked and flagged-botting licenses in the same time. Easy as that.
Myself got banned on 7 accounts in single hit two times, before I figure it out.
But that is not new practice from Blizzard, there is enough threads about it already.
On the question, as soon as you dedicate machine for each botting group, you are fine, and the IP barely does matter, simply because, when they banned 7x GB2 bots, they left the 12/24-uptime PP rogues untouched ...