Gateway Pucks are the hub of the Flair Network, so make sure they are centrally located to Smart Vents and Sensor Pucks.
RF range depends entirely on the layout and construction of your home. You can check signal strength in the Flair app to see where to place Gateway Pucks.
Pucks controlling an IR device have an IR of about 15'. The Puck's IR blasters are located at 10:00 and 2:00 on the sides, and at 12:00 facing you. The best placement for the Puck is on an opposite wall, or on an adjacent wall, and in line of sight of the IR receiver.