Good tips in the thread already, but I'll summarise here and include an extra tip:

- Place the renaulds on the middle ring, furthest point from the boss.

- Place the renaulds in the same 'hit box' so shieks/voices will affect them all

- To ensure your re-pet timers are guaranteed to renew on a phase change, hold DPS at 82%, 62% and 37% (changes are 2% below these) and wait for a shriek before phase changing. (voice for the 82%)

- Perhaps the most experienced tip I can give, and the only one I've not seen mentioned in the thread is to 'angle' the front side of each of your renaulds so they are facing the boss before they get petrified. (This may require you to kite them around a bit before bringing them to the stack position, depending on how long you have until the petrify goes off. ) The reason for this is because the rotation of the boss in her last phase has longer delays between the voice/shrieks where your renaulds can have a chance to wake up. The way to prevent that is to refresh their petrify with the bosses newest ability "patrifcation", which requires them to face her.