I just replaced my Rumba this weekend… The endstops are not plug and play you have to change the wires. They use the two outer pins on the Duet Wifi. Also be aware that the Z endstop is not used. You have to connect the Z end stop to the E0 Endstop and set the probe type to 4. example "M558 P4 X0 Y0 Z1 F500 T5000 H3" for probing to work correctly.

Im thinking about writing a guide from what I did but its all slowly fading. May write some stuff down after work.

~Roy