Don’t know anything about FBS zero spread account, but had experience with the same charge scheme account on Hotforex https://www.hotforex.com/en/account-types/zero-spread-account.html. For daily scalping it’s a really perfect choice as I do get sometimes 0 spread on EUR/USD, but most of the times it hovers around 0.2 pip. But I’m dedicated EUR/USD scalper so share my views only on trading with this pair, don’t know about any benefits of 0 spread account with other less-liquid pairs.