Engineered hardwood can go over that, but you have to temper that with the moisture that may come from the bath itself. Most of those require installation over a vapor barrier, so moisture from below isn't the killer, potentially that from above might be. Of the available brands, my preference is www.kahrs.com. They've been in the wood flooring business over 150-years, and it's the only thing they do - they do it well. You'd have to see what they recommend. I'd check on www.johnbridge.com for thoughts on tiling what you have. Lots more experienced tilers there.