2. Some anti-bows are a bit suspicious, but for the Red House, the arc of the anti-bow is not large (the east unit of the Red House is seriously damaged) and the distance is far away. If the red house is above the fourth floor, I don't think it is necessary to solve it at all.
3, you can buy it, in front of the Red Mansion (it should be south-southwest), seeing the pool is a Universiade, water gathers in the heart of heaven, and water sees the mountains, which is beneficial to Ding Cai.