Hi,
Something else you can do to place objects is right click in the 3D Preview with the mouse over the location on the terrain where you want the object. Choose "Copy Coordinates" from the menu which pops up. Now go to the objects parameter view. Look for the Translate parameter. To the right of that is a button with a clipboard icon. Click on that button and choose "Paste Coordinates" from the menu which pops up. This works in TG2 as well as TG3.
Something to keep in mind is that copying coordinates from the preview is more accurate when the preview is more detailed.
I'll make a start on a guide to using objects in the not-too-distant future.
Regards,
Jo