I am starting this thread to release some self-made assets.
To start with, here a little pack of modular 3d models. They have UVs for 1 square meter materials. If you assign different materials to them, you can make them fit to many different environments, here some examples as modern office elements or Sci-Fi.
The attached .zip files contain the models in .fbx format, which you can import directly to youre unreal project.