How To Deal with Hiring Developers?

I have to manage my projects and outsource them, otherwise, I would never make enough money to keep my business afloat. I have this problem, where, when I start a project, the product owner will ask questions like, "What happens if you die?" and my best answer to that is, "That's why we have employees". But, when I go to hire employees, sometimes they completely just ignore the stack that I'm using and they go off and do their own thing, which becomes difficult to manage. Should I be ruling with an iron fist, or should I just be more of a liason between my clients and my developers? How To Deal with Hiring Developers?