we broke the rules

There was one shot which we thought had violated the 180 degree rule so I went back to the saved scene, viewed it from above and marked on our camera positions.

In conclusion we did break the 180 degree rule, but nobody watching the film actually noticed.
To justify the breaking of the rule it was the only way that shot could have been set up, otherwise the second monitor would have gotten in the way. The shot was also necessary to break up the conversation by viewing it from another angle.