First, open your camera view in blender so everything is visible in 3D View. Once your view is correct, select all objects that need to be aligned by pressing Shift + A or selecting Object > Select All Objects from the menu bar. You can now manipulate all of your selected objects. If you need all of the selected objects to move together as a single entity for easy alignment, press Ctrl+G or go to Object > Group Objects. This makes it easier when dealing with large groups of separate meshes that need perfect placement relative to one another.