In my limited wand knowledge this has been terrible advice. More often than not the place/mob that has a wand is more like an afterthought in an area rather than it particularly fitting in. Just some random mob in an otherwise non-particularly-magical area that happens to be magical. To a certain extent it has to be this way or otherwise every wand would be located somewhere in the tower of sorcery or something silly.

Anyways, the best way I've discovered to find wands is to totally ignore area/mob types is to get the detect wand thing and systematically walk the entire map. Not that I've actually walked the entire map... but basically just enter every room of every area that I think is reasonably safe and see if I see pink. This is best/easist done with a good/neutral conjurer or a muter.

The second most effective way for me is to find someone else in game who is also looking for their wands. That way we can share each others locations.

Best of luck.