With our company SOP's we are NOT allowed to capture the GS from above. If it's looking to head that way then call go-around or ask for vectoring to come back around and try again. My opinion is that if you are kinda 'forced' to capture from above than you might be flying a rushed approach and seriously consider breaking it off to try again after a quick DODAR session. Nothing wrong with that IMHO.
I've had false LOC captures before (particulary at MAD) but no false glideslope's yet. ZRH is one of those places that tries to keep you high and fast as well. So that's in our descent briefing and what action to take if your mentioned scenario happens.