Is this opportunity available for groups?

Yes, it is available for groups once everyone in the group complete and pass all the pre program requirements

I'm not sure how big your group is but my sister and I went as a pair and so did some room mates we had at our host families place. Now 3 would probably be reasonable, 4 might be safe but I would say anything above that would be pushing it for sure. The host family we stayed at held 5 of us at one time so I know its possible but it would depend on how many people the host family can hold and how many people are already there. Now I dunno if this is directed at going with host families or not but if it is, I hope this helps. :)