I think the only countertops to be wary of using would be marble or tile with white grouting. Granite, quartz, Corian, or even formica should not give you any trouble with staining.

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Hello Vinayak, wpc sheet with acrylic laminate will cost you the same as natural stone like green marble of common shade granite. The second option is more sturdy then the first one .

Your quartz should be installed on a level surface. But there are a couple of ways to make this happen. For one, you may be able to place shims under the cabinets to level the tops. Or, you might opt to put plywood over the cabinets placing shims underneath the plywood as needed. Greetings from Aura