Feng Shui and Mirrors
Generally speaking, if placed, a building cannot have more than three Bagua, whether it is a concave Bagua mirror, a convex mirror or a flat mirror. On the same floor of the same building, one is enough. Even if someone else hangs it, if it is the same building, it has blocked evil for everyone on this side, and you can all benefit. But in your case, it is reflected by the mirror, so there is no need to worry. Even the Bagua Mirror will not have any impact. If you hang a three-pronged item or an item depicting a god general riding a tiger holding an artifact, it will be harmful to others because it brings evil spirits. But gossip does not contain evil spirits, so it will not have a bad impact on others.
Supplement: You said that your balcony is equipped with floor-to-ceiling windows. If the floor-to-ceiling windows are next to the hall and there is no extra wall next to the floor-to-ceiling windows, and the hall can be completely seen through from the opposite floor, then your own Feng Shui will be good. It’s a bit suspected of leaking money