Comment by lelandbatey

Something you can consider are "dentist office screen mounts". They're what they seem like, arms like you'd see at a dentist office/hospital that swings around an entire room, to hold a light or screen. See this example Amazon listing for one that mounts to a wall with a 5foot swing area: https://www.amazon.com/DW630-1218-Long-Articulated-Adjustabl...