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It depends what info you want to display.
The Pi4 is only designed to run 2 HDMI displays and 1 MIPI DSI screen, so you cannot generate 6 different video streams simultaneously.
If you only want 6 static screens that only update periodically, you would still need smart displays that had built-in computers that could receive images via ethernet.
You can run 6 screens with a PC or a Mac, but running 2 or 3 Pi4s to get 6 screens is cheaper than running a PC or Mac.