2 eleven rack - dual amp through headphones?

Hi!
Question for you guys : Im a hobbyist looking to get a dual amp setup out of 2 eleven rack. Im not an expert when ot comes to connection, but I pick up pretty fast.

ive read a couple of threads that seem to indicate that we can do it, but a lot of that was supoosition or just lacking details.

So to better expend on my needs, i would like to have 2 different patch playing on my Eleven racks : 11r#1 playing rig1 on left side and 11r#2 playing rig2 on right side), out to either my headphones (from the 11r or?) or to my atomic amp. Im playing 90% of the time with my headphones.

edit to had that i have a midi controller as well

I don't know about the Atomic Amp, but for headphones you'd probably need to get a separate mixer, I use a cheap Behringer Xenyx 802 Mixer for things like this, where you'd run the outputs from both 11Rs into the mixer panned left/right and use the headphones out from the mixer. Hope this helps.