It would fit perfectly for the escape arc from start to finish
Ep.1 -> Chapter 1 and 2. I feel it would be for the best if the whole of chapter 1 could be adapted into a single episode and end right after the reveal of the demons and the vow to escape the orphanage, but it would need quite a lot of filler to reach 22 minutes. 1:1 won't happen, so it's likely they'll adapt ch.2 as well and the first episode ends after it's revealed mama can track the kids.
Ep.2 -> Chapters 3 and 4, they'll probably mess a bit with the order of events so the episode ends with mama revealing she also has an ID number on her neck. May adapt part of Ep. 5 and have the kids clean around the house to set up the arrival of sister Krone. Since they have to build up mama as a foe, I don't think they'll introduce Krone just yet.
Ep.3 -> Chapters 5, 6 and 7. Krone and Carol get introduced, adult shenanigans and Emma finds the trackers. Episode ends with the shot of the demons around the table.
Ep.4 -> Chapters 8, 9, and 10. Tag training, Krone joins the battle, quality time between Krone and Isabella, episode ends with Norman announcing they'll escape in ten days.
Ep.5 -> Chapters 11 and 12. All the spy chapters. They let Don and Gilda in on the "human trafficking" and feed them false intel. Gilda has a meeting with sister Krone. Episode ends with reveal of Ray being the spy.
Ep.6 -> Chapters 13, 14, and 15. Ray and Norman talk about his condition as a spy. They let Emma know and they continue their investigation. Episode ends with Emma talking about the hidden room.
Ep.7 -> Chapters 16, 17, and 18. Most of these chapters are just talking. We have the trio talking about the codes in the books, plus Don and Gilda sneaking into Mama's secret room. Episode ends with the confrontation between Don, Norman, and Ray May also include the resolution from the first pages of Ch. 19. Last shot would be Krone overhearing them.