(White) Canadian citizen, Chinese wife, Living in China

Came to PRC to learn Chinese language and culture as my in-laws are Chinese. I've had many schools offer me a job if I can get a Z visa, but they don't do it themselves: any foreign teachers they have or have had in the past they have found through an agency. I'm wondering if you know of an agency who would take me on, and send me to a school that I bring to them, or if that's even allowed? I'm only interested in working in ZhuCheng, Shandong as that is where my family lives.