Can this be installed over 2 mm White Eco-Foam underlayment? I’m installing on concrete so I want a vapor barrier, but hadn’t considered whether the extra cushion would be a problem when I purchased it.

Underlayment is not needed due to the tiles having an attached underlayment backing. That being said, you could install these over a 2 mm White Eco-Foam underlayment and should not run into any issues.
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