I kind of like the borax idea, that's what I use. I don't think it poses a toxicity threat to humans, well, particularly. I have a big container (quart?) that I bought pretty cheap at local hardware store. Rarely need any, it's enough to last 300+ years.
I've never known of an ant colony within this house. AFAIK, they've all been outdoors. I place a bowl of sugary apple simmered in a sock outdoors, the ants come, I bait and they disappear. None for a few years, which is a record. With covid and wildfire smoke, I need a break. Fingers crossed a big earthquake doesn't come now.