question about running autoupgrade tool concurrently

I have a quick question about a particular scenario: let's assume I have 3 databases to be upgraded from 12.1 to 19C, located on the same rac cluster (composed of 3 nodes).

Each database has its own DBA thus upgrade will be done by an individual DBA on a designated node.

I know the autoupgrade tool has the capability to have multiple databases in a single config file, but will there be any issue if each DBA will run the autoupgrade tool in his own session (on different nodes) each with his particular config file at the same time? I`m thinking of any possible conflicts..

Thanks

--
http://www.freelists.org/webpage/oracle-l