Most of those rear mounted kickstands that attach to the chainstay are junk.Unfortunately, if you look for heavy duty, that's what usually shows up. I call them Heavy Droopy. And they're usually worse than the light duty cheap steel ones that come with most junk bikes. the ones that attach under the axle nut are better, but any rear mounted kickstand is going to be tip prone, and a fat bike is going to stand taller than a normal 20" by several inches, so the bike will already be leaning a lot more on a 20" kickstand. A pick of what you have and the bike frame rear and center would help here.
Try uploading the picture to
https://imgur.com/ . It's free image hosting, and You can do so without signing up if you do it this way:
From that link, click on "New Post" in the upper left corner. Then drag your image, or past the URL on the page it brings up. It will bring up a new screen and ask you to give it a title, sign up or sign in, etc. you can
IGNORE ALL OF THAT. On the right hand side of that page is an option to post "To Community" or Hidden" Choose "Hidden". Then it gives you in the pop up that says "Copy Link".
IGNORE THAT TOO, it takes you to a page, not the image. Instead,
X out of the pop up, right click on the image, chose "View Image". Now copy the link in the address bar for that image, and you can post that here. It should look like this: https://i.imgur.com/vkjcGj7.jpg
Bonus tip: you can make the image smaller or larger by adding a command in to the img tag. just change [ img] to [ img width=640] (without the first space)
what you'll get is is this:
[ img width=640]https://i.imgur.com/vkjcGj7.jpg[/img] take out that first space, and an image will appear in your post.
You are likley going to have to start with a 24" or 26" kickstand, and cut it down to fit. Depending on what you have, and how your frame is shaped, it might be easier to grab a 26" steel center mount kickstand, and a BFH (Big .. um,
fun.. Hammer), and re-shape it a bit to clear the back tire