My reception space used green screen to extend the height of the set so I decided to show on the model where it would be placed in relation to the action. In the actual space it would be hung from the rigs just feet above but could be also fixed to the top side of parts of the ceiling to secure it. There may also be a need to fit part of it behind lighting so that the space below can get sufficient light to create the right effect. Any lighting rigs can be removed digitally.
The last image shows the green screen position in relation to the set and the rest of the build.