You should be able to add trigger(s) for "window created" for your application(s), then add a "run function" action to the trigger "apply wallpaper profile:FooBar" (assuming you have already created the wallpaper profile(s) - they won't appear in the action's pulldown "run function"list until you do...)

Or, if you plan to create separate monitor profiles for each scenario (I couldn't understand if you were doing that or not) then you can just assign specific wallpaper profiles to your various Monitor Profiles in "Monitor Configuration - Manage Monitor Profiles" and change the Monitor Profile with the "Window created" trigger(s).