I am so scared to let Mackenzie run around the yard without me right behind her watching her every step, worried she may find herself in a fire ant bed!

I scour the yard all the time and treat it with those granuals (can't remember the name of the brand) But I'm so scared she will become covered by those monsters and not have a chance if I'm not right there to save her! It wouldn't take long for them to cover her, she is so tiny... anyone who has dealt with these things knows how quickly they move, they are awful!..anyway...my question was.....What is the best product out there to rid your yard of these terrible pests?....I'd love any advice....Thank you!