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Underlay is not required with Carpet Tiles, however for added comfort you may choose to use it. The underlay will require gluing down to the sub floor before installing the Carpet Tiles. Some of our Commercial Range Carpet Tiles available in a cushion backing in place of the PVC. Please Contact Us for more details.
I question though your suggesting using an underlayment over an existing peel and stick floor before installing a laminate floor. I may have mis read the post. We put the allure 100% water proof trafficmaster down and were told by the mfg,and three people at HD to not use the underlayment but to lay it right over.