This is what I’m using - Beetronics are specialists in small monitors.
I’m using their mounting stand - simply pasted some adhesive velcro to it with the counterpart on my master keyboard. Works perfectly as my “side mirror” - I display the show notes view on it in really large type, so I always know where I am in my show…
This is what things look like on stage - the small monitor simply sits on the right side of my rig, so it doesn’t get in the way.
(the laptop is normally closed during the gig - I’ve set it so it doesn’t shut down on closing the lid).
Beetronics also have relatively affordable touch screens (USB + HDMI) in small sizes - too fiddly for me, but may be useful for sume of us,
Cheers,
Torsten