If they decide, doubtful by the way, to ban your "legit" account it will not be due to IP but rather the interactions between the accounts. What people fail to realise when they go on about IP is that there are many cases of IP sharing where you have no clue whether someone on the network is botting/cheating/etc and thus Blizzard never bans based only on this information. IP would mostly be used to flag associated accounts and then a more thorough check would ensure, from what I assume anyway.
I second this information, and
I know it's true from first hand experience.
From the start of ROS through Season 1, I had a handful of accounts.
After using a bot to get all of them leveled and geared individually, I lost my will to run all of them at once as my PC at the time was overheating in the summer with just ISBoxer and no bots (even with watercooling). I assumed this would lead to reboots and downtime... I bagged the whole idea.
However, I setup one bot to run 24/7. Occasionally I would change to the other accounts just to try and keep their paragon levels decent.
They were all botting on the same IP. Only one of them was left on 24/7 for the majority of the time.
When Season 2 started, the main 24/7 account was banned, and none of the others were touched.
I use the others to this day. None of them were used to exchange gear, but at various points they were all playing in the same games together.
As mentioned, nothing is 100% safe, you ARE using a bot afterall.
However, if you're using the bot as a fighting companion to your legit account, I don't see where the problem would lie as bans appear to be on an account by account basis, not IP.
TL : DR I ran several accounts on my bot using the same IP address. One account was my primary that botted for weeks on end. These accounts were all at one time being played together in the same servers using a multibox. Only the one account that was used 24/7 was banned.
