About to set up a swarm, need advice

Im gonna set up a swarm system but what i have is all rel subwoofers. These are all powered subs of different capabilities. One is an almost top of the line s/812, the other is a t9x (middle of the line) and then i have two t7i. (Little lower down the line). The s/812 can get down to 19hz.
Here’s my question:
should I run the big boy S/812 in mono off of my amp and then just run the other guys piggybacked off of my speakers and place them around the room? Or should I run the S/812 off of a certain channel left or right or does it matter?

TIA
andrew