When to create new Group Chat Service

I was wondering about the following

I want to have several rooms on my server. The rooms represents soccer teams and are grouped in Premier League, La Liga, Bundesliga and so on.

When my client discovers these rooms it needs to put them in the correct collection.

To do this would the best thing be to

a) Add a prefic to each room.

So e.g. _ENG_liverpool would tell me that its english premier league

_ITL_milan would tell me that its italian la liga

B) Create one group chat service for each league?

Or should I solve this in another way?

I appreciate your thoughts

I would stick with one conference service (and prefixes), because multiple conference service feature is buggy now.

Ok Ill do that. thanks