No, it creates its own peer-to-peer wireless network between the transmitter and receiver, so it does not need an external Wi-Fi connection or internet access.
Yes, it is compatible with MacBooks via the HDMI port or using a standard USB-C to HDMI adapter for the transmitter button.
The system maintains a stable Full HD signal up to 30 meters (100 feet) in an open space without significant physical obstructions.