If by "all systems will be rendering in the office" you mean that there are 16 machines rendering in the office (all 11 main licenses, and 5 render nodes), then you will have no remaining licenses to use Corona elsewhere (technically, you will have 11 GUI licenses so you can see the Corona interface, but zero rendering licenses for IR or similar, even for rendering material previews).
EDIT probably the best bet is to get one more Render Node for the office, and that leaves 1 main license free and clear for use elsewhere :) Assuming you don't want to just remove one machine from rendering in the office of course.