correct way to install on roof with concrete tiles

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Curious for some advice - assuming I select an installer that I'm comfortable with what should I be looking for with how they plan to mount the panels to the roof? The house is about 20 years old with a roof built from trusses on 400mm centres using concrete tiles. I'm not sure what the dimensions of battens are but general advice seems to be that the brackets should be screwed to the trusses rather than hooked over the battens. In either case should I expect the back of the tile to have a groove cut into it so that the tile doesn't stand proud? Any advice gratefully received.

 

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Sorry, I know better and should have done a search. A couple of helpful threads:

http://www.electriciansforums.net/photovoltaic-solar-panels-green-energy-forum/32065-shuco-mount-thin-concrete-tiles.html
[URL="http://www.electriciansforums.net/photovoltaic-solar-panels-green-energy-forum/34591-fixing-brackets-concrete-tiles.html"]http://www.electriciansforums.net/photovoltaic-solar-panels-green-energy-forum/34591-fixing-brackets-concrete-tiles.html

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