Apparently nobody understands the issue. The UPNP browse function is built on a tree structured format comprising "containers" and "items".
The "items" are basically tracks; they are the leaves at the end of the tree, and they contain meta data like Title, Album, Artist, Composer etc. and they include cover art resources.
The "containers" come in many flavours; a container of type "Album" will contain "items"; and usually also has some meta data in it too (Title, Album Art, Album Artist) including the album art resource.
Other containers can be of type "Genre" or "Artist" say, and they may contain either Album containers or Genre containers. These types may also contain meta data including an art resource. Although many UPNP servers don't bother to supply art resources for them..
And then there are containers of type "Folder" which are equivalent of PC file system folders. They may contain any combination of the above mentioned containers or items, but they usually don't have their own meta data.
What the OP is asking for, is that MC should not publish tv series items within a container of type "Folder" (without meta data) but rather publish them within a meta data rich container instead. I don't have the UPNP specifications with me, so I can't remember if there is a container of type "Series". I would be surprised if there isn't. But if there is not, then one would probably use the type "Album" perfectly well.
EDIT: it seems that there is not a container for TV Series, so I would suggest just to use the object.container.album class (see attachment)