I use a mix of live traps, fenn-type spring traps and bait boxes. I find the bait is best and in proper boxes it is never accessable to non-target species. Tomcat2 and Romax difenacoum are my alternating preferences at the moment.
Eradibait is a complete waste of money from personal experience and from many others who have tried it. I understand dehydrated sugerbeet (as sold for horse food) is a much better and cheaper option, put a tray of the sugarbeet down inside a building somewhere keeping it dry, make a water source available outside the building. Theory is that the rats eat the dry sugarbeet and then go outside to get a drink, the moisture inside the rat makes the sugarbeet re-hydrate swelling up as it does so
Guess what happens to ratty when the beet swells too much