This is a important problem in the all the stables ... I think we agree that rodent traps are to be banned and the products too ... Because there are other animals in clubs, barns, ... I would say that the most useful is to have a specialized piece that is high (a few centimeters) and that is closed. So that no little beast will go. After that it is a silly solution, but you have to be vigilant, check if the bags are not holed, stay alert if you hear noise ....
After there is another solution, very NATURAL, you have to have 2-3 cats and let them chase the rodents !!
Bye, and good luck with rodents !!