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Experienced flooring installer needed

Getting conflicting advice re products from two flooring stores. Prefer finding an installer to look at the space, recommend a product then install. Is old house so the existing floor isn’t 100% flat in one area. Need your advice to resolve. See pic, we have discovered old Lino under the existing laminate flooring that we’d rather not remove. Had chosen karndean product on left but it’s very thin. Someone else has recommended thing on right - quick step.