You can try that.
www.actualtools.com/virtualdesktops/independent_vi...
www.actualtools.com/virtualdesktops
I would like a better understanding what you mean by "different desktops". Icons and Wallpaper? The programs at startup to open in a specific monitor? Or use virtual desktops vin10?
Homo mu that for some purposes it will be enough any
UltraMon and/or
Actual Window Manager.