The alliance that finished 200 has an average prestige of 33395. Based on that, I’d say you want to aim for around 33000 prestige for top 250. If your alliance can get to 33k, and are doing Map 8, you should be close if not above the top 250
You can find this by looking at the previous week’s AQ leaderboard and the searching for the alliance. When you click on the info button on their alliance screen it will show the alliance prestige.
My question was not about the RAID week, but about a regular week. In terms of placement, it is calculated differently.
But if the alliance you mentioned plays map 8 four times on all BGs, then I accept your answer.