For standing candy machine with a pole, I use a 2 inch wide glop of vaseline(or similar) around the pole just under the main standbox. If they could walk on it, which they can't, their little spit trails get lost in the goop. No ants.
My 10/yr old Daughter Lily is very entrepreneurial, so I got her a UTurn and made a flyer for her to hand out to potential locations around us. Feel free to give crits, tips, ideas, here is a smaller version: