Wow that sounds like a good deal to me, I had so much trouble when I had a house trying to find anyone who would do rodent exclusion work and spent a lot getting handyman services to do it.
Also, it would save you from expensive repairs if the rats chew through a wire (not to mention the risk of fire). I had one wire in a wall that had to be replaced and not only was the electrician expensive, they sawed into a lot of drywall and I had to pay to have that fixed up too. Then I repainted myself but had the expense of paint, brushes, etc. I'd highly recommend excluding them because that works the best. I didn't have any luck with scents they supposedly wouldn't like. I also wasted money on traps that didn't work. Exclusion is the way to go.
The best poison that my rodents would eat was the RatX type, but although it claims that it reduces the odor of their rotting bodies that was not my experience, I had at least a few very unpleasant weeks and two or three months before all the odor went away. Also, RatX is non-toxic so you don't have to worry about secondary kill (safe for owls and neighbor dogs if they eat the poisoned rats).
https://smile.amazon.com/EcoClear-P...tural-Non-Toxic/dp/B00RU6YHJW?ref_=ast_sto_dp