There are people using two Mutec MC3 reclockers in series.
From catcando on audiophilestyle:
“Just a quick update.
I am now using two Mutec MC3+USB. More of everything!
I emailed Chris at Mutec, and he said some customers, who are using two Mutec's, are connecting the clock output, from the first one, to the clock input, of the second one, and setting the second one to EXT/RLCK.”
https://audiophilestyle.com/forums/topic/16801-mutec-mc-3/?do=findComment&comment=729538
One reclocker good, two reclockers better. £845 a time.