Let me add this. You can place bar stools on the side of the stall that comes with Eco Lifestyle. It's kind of cool but I am playing in Willow Creek right now. I have problem. The vendor shows up but the stall is missing. The vendor just stands there. It's been a full year of seasons. I decided to put on cheats and delete him and restarted the game. He came back but still no stall. I am doing the 100 baby challenge so I have no mods in my game. I have aging on. That Sim is going to die of old age. Imagine spending your life standing in a garden doing nothing. I repaired the game game, cleaned files and nothing worked.
Anyway, to the op. If you want to use the Tool Mod you can place your stalls outside of the lot and vendors should show up without hiring them. There is a lot of space around that park you could use to place them off the lot. They do all sorts of cool stuff with that Tool Mod by TwistedMexi.