Suggestions for Buying a Portable Monitor

[rollsman44]

I just want to be able to see the Images of the portraits I shoot and show the model as well. Instead of looking at the back of my camera ( I am using Pentax 645Z and X1D2 )
Size: 7-12 inches. I will mount the monitor and Camera on a T bar one on each side and connect the cable to camera to monitor. Thank you