If you ask a hardwood flooring salesman, he'll probably tell you that underfloor heating isn't a problem. If you ask a heating engineer, he'll only tell you about tile or glued vinyl. The fact is that wood has a worse thermal conductivity than tile, for example. However, you will likely end up with a warm room anyway.
Gluing is certainly not a mistake as far as warm floors are concerned, the air gap in floating installation insulates again. However, some people find that a floating installation improves the feel when walking.