I chucked an offcut of some rubber coin matting on a wing and I think it does look like it would compliment the overall looks:
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So in terms of looking at the wing and any reinforcement UK models have, then it's worth looking at the 5 bolts down each wing inner edge (under bonnet):
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They seem to not only reinforce the weaker inner edge but also run right angle "pier" supports down to the lower surface:
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Whilst you can press down and feel deflection in the midspot of the wing, both edges are firm.
Some 3mm chequer plate, or other suitable robust material would probably take out all of that central deflection; but without it I don't think there's a problem, weight-wise, sitting on the wing.
One point of note if drilling through the wing tops is that on the left side (as per photos above) runs the large electrical cable attached to the remote positive terminal; and on the right side runs a similar diameter coolant hose linking the low(?) pressure header tank to the radiator.