If they are all watching the same channel then you would only need to cable for one, output it to the input of a distribution amplifier like CELabs AV400COMP (for 4 componentconnected TVs) or for 5 component TVs
https://celabs.net/products/av-distribution/component/item/av501hdxi?category_id=120

or for HDMI

https://celabs.net/products/av-distribution/hdmi/item/ha8-3-2?category_id=112