One station is right in the run. You place them in corners or along walls or under the coop, ya know, where rodents travel. I've never seen that gel pack posted above. I'd not use pellet decon stuff as that gets littered about making it dangerous. Chunx gets chewed off therefore not littered but in the cheeks of intended animal that then brings it to feed the brood. There wont be bits of poison in the run with chunx. 99.99% of the time the rodent dies in it's hole in the ground and of course all the new born so the next generation boom is taken care of. We were once inundated with rodents. Nightmare as they made it to the house. Ugh...It took a few weeks for the rats to start taking the bait but once they did it went quick and you'll go through a good amount for few weeks then it stops. Yup, you killed the colonies of rats. Hundreds apon hundreds that you'd never get under control with any other method. I keep only two bait per station most of the year. During spring and fall they are filled up when rodents are on the move. You'l go through a lot those times of year but almost nothing the rest. Rodents are always about but these stations keep them from making your coop, run or home their home.
We've started on our third pail in 4 years. That's two stations and taking care of a huge infestation from first use. And squirrels chewed a hole in lid last year to rob and store elsewhere before they died. It's cheap to maintain bur the initial costs of stations and poison is a bit steep. A pail should last two or more years when maintenance but you'll go through half your pail or more to rid the initial infestation.