I only have one, but a RaspberryPi 3 with the "official touch screen easily runs node-red and I display the key information from three other node-red systems on its dashboard with Chromium in kiosk mode. I found a nice ~$25 case on Amazon that can either be wall mounted or sit on a desk or counter-top.
I believe these are competitive in cost with cheap Android tablets and IMHO far easier to deal with.
To perhaps clarify a bit, instead of having multiple dashboards displayed in multiple places, I make a custom dashboard that integrates the needed info from the multiple systems to what is appropriate for this location and run it locally. Doing it for well over a year and the local dashboard displayed in Chromium kiosk mode has had almost perfect reliability whereas dashboards displayed remotely in either Chrome or Chromium regularly display "aw snap! something went wrong" and need to be manually refreshed to display again.
