Adam,
From my understanding, AC has no issue with practices sharing AC. The ONLY stipulation is that the name of the practice is the same. Each provider would still need a licese just like in a normal one Tax ID practice.
The issue, if I am reading this correctly is space. The practice may have six exam rooms, and they don't want to have three computers and monitors in each room. Some of us have given solutions such as VM, etc., but I can certainly see where they are coming from.