Site-specific Custom Nginx Rewrite Rules Not Working

I believe the location for inserting the site specific nginx rewrite rules is:
/var/www/website.com/nginx/

and the filename could be rewrites.conf

I want to paste the following rewrite rules:

rewrite ^/sitemap(-+([a-zA-Z0-9_-]+))?\.xml$ "/index.php?xml_sitemap=params=$2" last;
rewrite ^/sitemap(-+([a-zA-Z0-9_-]+))?\.xml\.gz$ "/index.php?xml_sitemap=params=$2;zip=true" last;
rewrite ^/sitemap(-+([a-zA-Z0-9_-]+))?\.html$ "/index.php?xml_sitemap=params=$2;html=true" last;
rewrite ^/sitemap(-+([a-zA-Z0-9_-]+))?\.html.gz$ "/index.php?xml_sitemap=params=$2;html=true;zip=true" last;

• But simply pasting the above code into a blank nginx conf file would be enough?

• Does the filename matter?