On linkedin, i read this blog on 6 things to look for in a Chinese manufacturer.
The best way to get copy quick is to find a supplier with industry experience and experience with similar products. You will give them free R&D and new ideas.
For quality control, nowadays we are common to have quality control at the end of the production line to inspect all the goods, but we need to understand that normally the production must do the quality, having someone at the end of the line will not stop quality problems.
If the production is not implicated in quality then the products will always have quality issues. I was taught that quality must be made by production department.
What is more and more common now is that poka yoke are implemented directly in production jigs and production process to limit variations. The key thing is when you visit suppliers to ask them what is done in production process to avoid quality issues, not only add people to 100% visual check.
Trustworthiness and reliability
To reduce the risk of copy, do go to same industry and same product experience supplier, especially big ones.
Like i used to say BMW is subcontracting Mercedes to build a BMW car.