Another method that seems to work well, at least for me, is to click on the ""Select different cameras or viewports" button in the preview section and then select "Top view". Right click in the preview window and select "Select object or shader" and then the object you want to find or position. You may have to use the navigation controls and zoom out. Using the zoom controls, you should be able to see your render camera and object. The object should have the red and blue position vectors where you can move the object.
One thing to remember is when you have it positioned the way you want, click on the "current render camera..." -- not the "Copy this view to the current render camera." You should be back at the same position when you started, but if you positioned the object, it should be in view (of course you may still have to raise or lower it in the y axis.)
Also, sometimes temporarily scaling the object to a real large size can help.