Photomontage with an obj object.

I am a designer and I have created a model for a showcase for the sale of products. I have the file in obj, but my client has asked me to perform tests of how the object is already embedded in images of their agencies. I have 4 images and 3 obj (max) files with the respective textures. I need to keep the obj file and it looks relatively natural to include that object in the 2d images. Attached obj file, and 4 photos of the offices. You can remove all the objects that are needed from the images, the idea is to see the inclusion of the showcase as natural as possible. Use the different angles of the obj file and use at least 1 model of each of the exhibitors. I need to know what time it takes and how much it costs. Files obj in this link [login to view URL]!Alep12Sxi1MWiFcPeTn6d6YXgua9 And above all, discretion.