Lots of things eat dead things and if they have died of poisoning then they are also full of poison. If the dead rats cannot be removed by a predator then it is probably OK. I have seen raccoons get into bear-proof containers so there is that.
The reason I said to check them twice a day is because it tends to be hot in attacks and dead things and hot places are not a match made in heaven.
While the bait is an attractant, the amount is relatively small so I would be surprised if it increased the immigration rate significantly.