Should DV360 Fees Be Accounted for Before Allocating Campaign Budgets?

When launching campaigns on DV360, our usual practice has been to deduct the DV360 service fee from the media budget (allocated funds for a particular media or channel) before setting the campaign's budget. However, after some investigation, I have doubts about this approach and need advice from DV360 specialists. My question is: Should we deduct the DV360 fee from the media budget before assigning it to the campaign? This would mean allocating a slightly reduced budget compared to the original media plan. Alternatively, should we allocate the full media budget to the campaign and let the platform automatically deduct the DV360 fees afterward? I'm concerned that we might have been underspending by deducting the fees beforehand, or whether our current method is correct. It's imperative to avoid both underspending and overspending by ensuring the correct budget allocation at the campaign level.