I work in a professional setting where everyone is looking to move up pretty quickly. I have worn 3-4'' heels to work with professional skirts or dress pants and button down shirts and no one has given me any crap for it (and believe me, if they have a problem with what you are wearing, you'll know about it). In fact, I even run new shoe purchases by my dad to see what he thinks (he has worked in a professional setting for forever) and he has never once shot down my shoes based on height. It also depends on (IMO) the thickness of the heel... a really thin heel can look less professional unless the shoe has some other feature to detract from the heel itself (if that makes sense). I think in terms of height these shoes will be ok. BUT there is something that seems to make the shoes less professional with the hidden platform. What line of work are you going into?
I'll just end this unnecessarily long post with what my job told us at training - if you question what you have on, then it's probably best you don't wear it.