Different subdomain for branded and unbranded website.

My mls requires a different sub domain or url link for the branded and unbranded website link. Such as mls.listingwebsite.com and listing.listingwebsite.com for example or the url itself can be different. So I cannot use spiro for mls tour links right now because my whitelabel url link is the same for both branded and unbranded. (Despite having a different suffix which are different)