I have a small studio/rehearsing-space and have experimented with a lot of different small trays on microphone stands, on hihat stands and on keyboard stands.
This one is very simple but actually works best. Both a cup-holder and a small tray for keys/cellphone/earplugs/iems etc. Fits most places where I need it to be.
It’s a bit plastic, but also very light and still functional. I would recommend it.