Will a horizontally scaled video bridge connect users to video bridges by proximity?

Considering that there is a relatively equal number of users per videobridge and that load would not constitute an important factor in deciding, would users be allocated to bridges by their median latency, or how are they allocated? Are there any configurations? Is there a manual for MUC and configuring a geo distributed cluster of video bridges? (I plan to use frp or port fw where needed)
Thanks