Besides the roof towers I've also seen mounts where the rotator was in the attic with
a mast extending up through the roof. I think one article was in one of the volumes of
the ARRL Antenna Compendium, but I'd have to look back through to confirm that.
I wrote one a l-o-n-g time ago. I've done it twice (two different QTHs) and about to do it again! Here's a link: http://archive.org/details/73-magazine-1986-09
. The article is titled High and Dry on page 50. Click on the download method of your choice on the left side of the page.
Jack - WA2OLZ