Just to point out, there may be an issue with what triple pedal unit can be used with the Numa X Piano GT and the SL88 GT Mk2 that could be a factor for some people. I read that the triple pedal unit that Studiologic offers for the Numa X Piano GT isn't the best, but that the Roland RPU3 triple pedal unit (which seems to be considered pretty good) can be used with it (I think the member David B may have pointed this out). But the Numa X Piano GT and the SL88 GT Mk2 seem to have different jacks for the triple pedal, so it's not clear what triple pedal units can be used with the SL88 GT Mk2.
(I've only looked at it a little bit, but it seems the Numa X Piano GT has 3 jacks that can work with a continuous pedal, while the SL88 GT Mk2 has only 2 jacks that can work with a continuous pedal while the 3rd jack can only work with a switch pedal.)
Numa X Piano GT:
https://www.studiologic-music.com/products/numa_x_piano_gt/
Pedals
Ped 1-2 Switch/Continuous
Ped 3 Multi Function
SL88 GT Mk2:
https://www.studiologic-music.com/products/slmk2/specs/
Pedals
Switch, switch/continuous, universal