All of them will need some small plates welding in to stop them punching through the floor in the event of a roll but with the carpet back over no one would be able to tell that unless looking deeper than a casual inspection.
I think that the Safety Devices one John sells (or used to sell?) is as good as it gets for a bolt in, the weichers one is also good but worth checking what needs doing to it as I believe Shirmer makes a few mods to them before fitting and you need to specify a specific CSL fitment if you want to retain the rear side carbon panels from memory (was speaking to a dutch guy in the 'ring car park as he'd had one fitted to his).
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