Do you support sub-subdomains (multi level subdomains)?
No, we don’t. SlickStack does not support sub-subdomains, because there is really no good reason to use them for PHP-based CMS websites. We are focused on technical SEO and usability, and sub-subdomains create various management headaches. The biggest one is SSL related, for example Cloudflare does not support sub-subdomains on their free plan meaning that you’d have to purchase their premium plans if you are using OpenSSL paired with Cloudflare.
There might be certain features of SS that support sub-subdomains and with some hacking you might be able to ensure it works, but we don’t aim to support it whatsoever.
You’re on your own if you try to go that route.