John - correct on the above if I’m reading it correctly.
Node > sub out > y-connector (male to two female) > separate RCA runs to each subs’ LFE.
Node > RCA R & L output > Amp R & L input
Master volume through Node’s variable volume control. If the sub’s signal is low (like you’re needing to really push the gain on the subs) you could also play around with another y-connector (female to two males) into R & L inputs of the subs.