RPi and Unicorn HAT HD

I am trying to use two Unicorn HAT HD (16x16) on a Raspberry Pi 3 or 4. It seemed that connecting them as Independent slaves was the correct approach and looking at the example,

thought things should be straight forward. With careful reading I see example uses different software.
I am going in circles looking at the library to see how to make it work with both CE0 and CE1 (P1 pins 24 and 26)

Any pointers appreciated.