I have been asked to install hardwood by a couple who has a family room that sits on a slab. They have carpeting now and underneath is the old 60's 9" tiles. Tiles are perfect - old looking but no cracks or pieces missing anywhere. I have installed hardwood in several rooms now but never over tiles, which I figure contain asbestos, and never over concrete, which I know will require some sort of barrier, given wood contact. The last caveat in this deal is that the flooring must be resistant to high traffic wear man has no tolerance for a floor that "gives" in way and he expects "nothing less than a rock solid floor"

, so I am thinking gluing may be the only option.
Can anyone give suggestions regarding the best flooring type and installation methods for this application. My first blush idea was a medium thick (1/2")engineered product of some sorts. Agreement?
Thanks in advance. I got good help here when I asked about doing a patterned fllor.