On the right side of the screen, there are options for 3 monitors, 2 monitors and 1 monitor. You can save each individual picture for each monitor and then apply each one to the corresponding monitor.
Once you have the ones you want, open your personalization settings by right clicking on the desktop. Then click browse and select the pictures you want to add. Unfortunately, you can only do 1 at a time so if you have 2 monitors, you’ll need to browser to the location of each picture.
Once they are listed, just right click each one and select “Set to monitor 1” or “Set to monitor 2”
Heh, it's a Cyanogenmod 12 stock wallpaper - a photo of maple(?) tree leaves in Autumn.
I used to have a particularly tightly cropped version of this photo as my wallpaper for a few years but since I formatted my phone a few times in a month or two, I hadn't bothered to go back.
e: I have rather... uh... bright backgrounds at the moment, this is my wallpaper on my home desktop (over three monitors)
Is 2k what we're calling 1080p or is it that 2560x1440 res?
Personally I've been perusing Wallpaper Fusion
https://www.wallpaperfusion.com/Search/?Width=5760&WidthMod=1&Height=1920&HeightMod=1
but it might be better suited for dual/triple/quad 1080p monitors...
Also, for consideration: https://en.wikipedia.org/wiki/The_Starry_Night
16k is 15360 × 8640, The Starry Night is available up to 30,000 × 23,756 So if you ever need a desktop wallpaper to never run out of resolution.... ;)
https://www.wallpaperfusion.com/Search/?Width=5040&WidthMod=1&Height=1920&HeightMod=1
I grabbed a bunch of stuff that looks nice, and rotate through it.
So I went to https://www.wallpaperfusion.com/ and found one I liked. Then saved the left side as one size and the right as the portrait. I wasn't sure how it would look, but it happened to work perfectly. I'm not sure it always would. There is some app called DisplayFusion that is like $35 on steam. I know you can apparently do a lot with that so you can adjust the sizes to fit properly yourself too. I just didn't wanna drop $35 on that right now.