I own an engineering firm that mainly does EE design. I am registered in many states, but 70% of my business comes from CA. I have the traditional hourly and fixed price models, but I also offer monthly services to clients, where we become their entire engineering department. On fixed price or hourly contracts, we have a specific project. For the monthly contracts, we work on anything the client wants us to look at, which often includes preliminary sales proposals and other designs that go nowhere. Some of those monthly customers have us working on dozens of residential systems per month that are as little as $10,000 in construction cost. Please clarify with your legal team if the pre-lien process would be useful and not cumbersome for this type of arrangement.