Hardwood/Engineered flooring over concrete

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I'm still undecided about bamboo engineered floors or unfinished oak for an install I have coming up. Is one better than the other when installing over concrete?

What's customary for install over concrete? Is it adhesive? Can you float the flooring over concrete?

Jon K. I loved the bamboo flooring pictures from your big rental house. I can get that product here in So Cal. What was it installed over in that house?