WordPress rewrite rules under subfolder with Nginx

I separated different WordPress installation under the same domain name, but I need each of them have it own rewrite rules. So here is my solution to achieve it. 

// xxx.com/cmf/wordpress wordpress rewrite rules conf

location  /cmf/wordpress/ {
    index index.php;
    try_files $uri $uri/ /cmf/wordpress/index.php?$args;
  }