The lowest wattage possible is the best bet as watts = radiations. I have posted how to find them.
https://www.energystar.gov/most-efficient/me-certified-computer-monitorsIf you can, (very difficult), choose 12vDC and get a linear power supply.
Look for "tco" certification if poss.
You really have to try one and then return it if it gives you problems. Consumer protection offers this as the only concession to EHS. You need to ferrite filter choke the cables as much as possible.
If you use a laptop try to get one that is fanless and does not have a hard drive but uses a SSD. DC motors are very dirty and have high magnetic fields. Laptops generally are a very bad idea. Run on the battery always if you do not have a 3 wire and pin power supply into your power transformer box. Better to buy a fanless SSD Slim Factor from China, as they have very high radiation standards there. They are very clean and cheap.