SLI support?

Does League of legends support SLI? Nvidia website states it does, I have Nvidia inspector set for SLI (Though NONE of my games are ever pushed to duel for some reason) and yet I still only play the game on one GPU. I dont need to SLI them and yes my motherboard supports SLI I just want todo it just because I can. Well I guess I can't since I'm obviously doing something wrong.