When sourcing engineered hardwood, you must prioritize the wear layer thickness, typically ranging from 0.6mm to 6mm. For high-traffic commercial areas, a wear layer of 4mm or above is recommended as it allows for future sanding and refinishing. Additionally, verify the core material, which should ideally be multi-ply birch or eucalyptus for superior dimensional stability against moisture and temperature fluctuations. Ensure the Janka hardness rating of the top wood species (e.g., Oak, Walnut, or Hickory) aligns with the intended use environment.