1. My display cannot be adjusted high enough (this can be fixed by putting a book under the display).
2. Keyboard and mouse take up valuable space on the desk.
3. (most important) Display is physically closer and occupies more of my field-of-view. After a day of work this made me dizzy.
So now I'm happily using the keyboard tray again.
Ergonomics: https://uhs.umich.edu/files/uhs/ergo.pdf
Which keyboard tray did you get?
The lowest setting on mine is 26.0", that's still too high? I would imagine a keyboard tray would drop it another 2-3 inches setting your keyboard below 24" from the floor.
Here's what I'm working with: https://ibb.co/MGqcpxc (excuse the mess and wires)