A punching bag stand is better when you need flexibility or cannot drill into walls or ceilings. A wall mount is usually more space-saving and stable if the wall structure can support it.
Yes, some commercial-grade boxing bag stands are designed to hold more than one bag. A 2-bag tee frame can be a good option for gyms or training areas with multiple users.
Low-quality stands can shift or shake during hard strikes. A heavier commercial-grade frame provides better stability for intense boxing, kickboxing, or fitness training.