We're in the process of closing on a new house, and they have a very basic grey vinyl sheet flooring in the kitchen and back hall. It's in great shape, just...boring. Grey floor, grey granite, grey backsplash, white cabinets. I was wondering whether it would be OK go put Marmoleum over it? And if so, would it have to be "click" or could it be the glue-down tiles?

Thanks in advance!