How about throwing a strap on there? You could make and attacment point either side of the cans and loop it over the top?
Or even more convoluted: a stretchy strap to platform for the support and a fixed one at the top to keep the cans pressed down in to it.
I like your thinking!
@Polygon started
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How about throwing a strap on there?
You could make and attacment point either side of the cans and loop it over the top?