Forgot to note: The mounting is pretty good, but can not hold the metal/aluminum ergodox. They will be possibly ok for skinny arms, but not for the hammering thick arms that some have. Of course you can reset the pieces naturally, but this would be a pain.
p.s. This would not be a direct fit, you have to either make two L/S shaped plates for each unit to mount the sliding rails or you just cut them off from the comfort and put in yours. Even better get some plastic sheets and align few overlapping sheets to get the right profile. not tried, just an idea.