Always a touchy issue when someone comes along wanting to set up shop and who doesn't have much, if any, experience.
On what do you base your expected output? 3kg/day is actually 50% more coffee than 2kg/day ..... a fairly wide range.
It's rare for coffee machines to get bad reviews published.... if you were given a machine to review, would you dis it, publicly, then expect someone else to give you a machine
to review? = Short career in machine reviewing.
For the most part coffee output peaks at one two or three times a day depending on your opening hours.
Will you be open for breakfast when people want their coffee now, not in ten minutes while you wait for the steam boiler to recover temp?
Do you expect to be slammed mid-morning? Will you be serving lunch? 5/6/7 days a week? do you expect growth in coffee sales? >5kgs day?
Choosing a suitable machine doesn't depend on looks, some of the best look retro 60's ( LM Linea ), some look avant-garde and retro at the same time ( Kees ).
Choose a machine that will cope with your peak demand and not have you standing around waiting..... then 3kgs/day will quickly become 2kgs/day.
There are more questions posed by your post than can be answered.
If you were paying me for advice I would suggest either a 'built like a tank" 20 amp single boiler HX.
Or a "built like a tank" 20 amp dual boiler. I know of two Ruggeros locally.....
One, a multi boiler, had to be reconfigured from 15 amp to the 20 amp element 'cos it couldn't cope with demand 3 months after opening.... and still can't,
the other ticks over OK....in a small country town cafe. They are a decent machine but there are others to consider. More than one cafe has chosen a machine then had to replace it
within months 'cos of demand. Expensive, but you've got to start somewhere and there are plenty of ways to skin a cat?
Choosing a grinder ....... try your coffee on a couple of grinders, Major, Kony, Robur, Mahlkoenig, then choose your grinder according to the taste that best represents
what you want in the cup. Or you could narrow it down to Major or Robur..... flat vs. conical.
Don't take anything I've said as gospel but just as part of the conversation, others will chip in their bit.