well as for an sli profile, they have it set to be single card only right now Nvidia Profile Inspector is how i found that after updating to the 365.19 game ready driver
But if you want SLI to work in DOOM, this is all you have to do,
1. get Nvidia Profile Inspector, google for it, you can find it, or may already have it
2. After opening it search in it for DOOM and make sure the EXE is doomx64.exe if your not sure, remove that app, and add the new one.
3. Then head down to 6 - SLI and change Number of GPUs to use on SLI rendering mode to how many you have as in TWO - THREE - FOUR
4. change the sext on NVIDIA predefined number of GPUs to use on SLI rendering mode to the same thing as before
5. switch NVIDIA predefined SLI mode to AUTOSELECT, unless you want to try another mode, either SFR or AFR/2
6. GET BACK TO DESTROYING DEMONS IN HIGH FPS GOODNESS!
if you have any concerns, take them up with google, all i want to know is if it worked for you, as i have not found anything on how to do SLI with DOOM so i did it myself