I have multiple subdomains. No problem making an xml-sitemap, and I know google sitemap protocol doesn't allow to include URLs from different (sub)domains in a single sitemap, so I have to setup separate instances for every subdomain and generate separate sitemaps for them.

1) Do all these sitemaps go into the public root folder? If so, what's the naming convention for them?
2)Or does each subdomain's sitemap go into the (otherwise empty) subfolder for each subdomain?

Thank you!

1. yes, every sitemap should be added in root folder for that specific domain (all of them named "sitemap.xml").

2. each (sub)domain has it's own folder normally.
Thanks for the fast response, Oleg! This is a great tool!