I have been a licensed commercial applicator for about 40 years. Every year, I treat many athletic fields for fire ants. I almost always use bifenthrin, because it also helps with mosquitoes, army worms and several other insects. However, it does not have very much residual activity, so ants will eventually move back into a treated area from untreated areas.
The key to fire ant control is to broadcast the entire area. Treating individual mounds is never very effective.
Another product that is very effective and has longer residual is the active ingredient Fipronil. It will keep ants out for up to a year. It is more expensive than bifenthrin, and is more specific to ants. It doesn't treat mosquitoes, army worms and other insects.