Apostille vs. Embassy legalisation for Belgium
For Belgium the apostille is the right and full proof, and it is the only certificate this route needs. An apostille is a printed page that an Italian office joins to your record to confirm the seal and the signature on it. It makes no claim about the content. Because Belgium is a Convention country, that page is read as proof on its own, and nothing consular is asked of you afterwards. Do check the wording with the office that will file your case.
Belgium in the Convention since 1976
Belgium joined in 1976, so Belgian clerks have handled Italian pages for a very long time and the format holds no surprises for them. The gain for you is a shorter chain: one Italian office, then the Belgian desk. Where this route differs from a long-haul one is that the paper can be in Belgium within days, so the slow part is rarely the post. It is the wait for a clear answer about what to send.
Try the EU rule before you buy a stamp
Both countries are in the EU, and Italy applies an EU rule that frees some public records from any stamp when they cross to another member state. That is money you keep if your record is covered, so the question is worth asking first. Nobody at the Verona window can answer it for you, because the receiving office decides. The apostille requirements for Belgium therefore start with an email, not with a fee. Ask, print the reply, and stamp only what the reply names.
The two Verona windows and the €16 stamp
Which window you use depends on who produced the paper. A record from a comune, a school or another public body goes to the Prefettura, the state office for the province. A deed, a power of attorney or a court order goes to the Procura della Repubblica, which sits at the courthouse. Each paper carries a €16 tax stamp unless it falls in the exempt group, and no turnaround is fixed here, so ask when you hand it over. An apostille from Italy to Belgium is one stamp per sheet, never one stamp per bundle.
What the Belgian side will want to know
Belgian offices are precise about form, so give them exactly what they name and nothing invented. Ask which language they read your file in, how recent the record must be, and whether they want paper or a scan first. A Verona apostille Belgium file usually lands with a commune, a school or an employer, and each of the three asks differently. Quote their instruction back when you send the bundle. People who treat document legalisation for Belgium as a fixed recipe are the ones who post twice.