Y splitter is simple, easy and not costly…once Jason Stoddard posted some y splitters he uses from monoprice for a whopping $59 cents apiece!!
I use them all the time…if u look and want better quality ones for $10-$15 they are out there at Amazon etc
Also depenging on the inputs of your two amps. The Modius has both balanced and SE u could use balanced to one and SE to the other if one of the amps has a bal input?
Good luck!
Alex