Yep, the mini is perfectly fine without a hopper. The (now pretty standard) short hopper means its not terribly tall either.
Google for mazzer hopper mods... some people get plumbing supplies, others put a tamper in the top... I used to just put my hand over the top while grinding but now I use the short hopper.
If you go with a Robur or Kony (or maybe the Major, not sure) they wont operate without the hopper in place due to a sensor.