You could take the valance off and screw it straight into the bumper
 
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Tried to fit today, needs cutting down in both width and length, so thats first. But also not even sure it will look that good...
 
hmm doesnt look to easy, lots of people with corsas have done it and they've had to cut it in the middle and take a bit off
 
you can get the earlier laguna one without the holes...then you could fit it centrally and trim the sides off. and there are thicker bits on the top of the splitter that you can use to screw into to make it more stable.
They take a lot of abuse too and flex loads so un likely to rip off unless you are very un lucky.