"No, if they do not get above the treshold they will not get any seats."
What is the "threshhold" one must meet before qualifying for a seat?
I do not know the details of this plan. In Poland, the party has to have at least 5% and parties with the highest percentages get extra seats.
Otherwise in proportional system you get miriad of parties and very unstable governments. (It used to be so in Italy)