I help manage a condo complex with ten units. It is built on a slab. One resident got some ants and went ballistic over it. He was demanding that the entire complex be flooded with the variety of sprays provided by a commercial exterminator after he spent hundreds of dollars on baits only sold on the internet. Of course, several in the complex went ballistic in the opposite quadrant due to worry about impending damage or death to the dogs and cats that reside in the condos with their humans.
(Note that the active ingredients in the expensive stuff is the same as what you can get cheap at Wal-Mart or it higher scale clone, Lowe's)
Looking for answers I went to the internet. Various PhD folks have devoted their lives to ants and written a lot. I learned things that help.
First, ants are seasonal. They were here before us. There will be periods of time that they will be busy whether we like it or not.
Second, they live in the ground and only venture into our dwellings to find things to carry back home for eating and sharing with superiors. Sugars are their favorite. If you have an amazing abundance of ants, it means you've spilled things and not cleaned up well. Except for the very few wood eaters, they don't make nests in our homes, even the ones on wheels.
Third, they love coming through cracks in concrete more than crawling up our tires. But, they are always on a mission to find food for the nest that is full of the ants with the better jobs revolving around having ant sex.
Fourth, there are a bunch of varieties. Thousands, I recall. Only a very few eat wood. If you have those, you do have a problem. The others are only a nuisance.
Fifth, and maybe the most important, is that all of the "approved safe baits" work, but not on all the ants. If you don't know what ants you have, you need to get several baits that have different primary active ingredients. They need a buffet. And no, Raid and other sprays don't work. They kill the workers you see, but not the ones staying in the nest having sex.
Last, it takes time. The worker ants have to carry enough bait back home to share before there are results. Vacuuming dead ants is convenient, but vacuuming the workers carrying the bait back to the next slows down the process. It takes a couple weeks for the sex workers and their offspring to consume the necessary bait down in the underground ant brothel.