How do you usually use the terrain tools? And how often?

I usually just make the ground a little uneven all round. This house I attempted to work on lower terrain https://i.imgur.com/W7uP6CP.png
Still a work in progress and already run into troubles, apparently rotating the lot it can't do because it doesn't have a 'room'? and the lower ground does not rotate with the lot so getting frustrated with it this way.