These will not work on the default skins,a custom skin needs to be used.
I highly recommend FLUT Skin.
The pack includes over 9,700 stadiums from over 50 countries and over 100 divisions around the world.
How to add Mini Stadiums on Football Manager 2020
- Download the .rar archive and use a tool such as 7-zip for Windows or The Unarchiver for MacOSX to extract its contents.
- Move the extracted contents to your graphics folder:
\Documents\Sports Interactive\Football Manager 2020\graphics\
Create the folder "graphics" if it doesn't exist already.
- Run Football Manager 2020 and go to Preferences > Interface:
Hit the Clear Cache button. Return to this screen.
Enable Reload Skin when confirming changes in preferences
Hit the Confirm button
UPDATE with 190 IMAGES