Widget displaying Belgian weather info, from IRM/KMI, Meteo Belgique/Meteo Belgie, and meteox.be
Yes, you may have several instances of the widget in the sidebar and choose options independently for each of them.
The weather info from Meteo Belgique/Meteo Belgie is only available in French or Dutch. When you select Meteo Belgique forecasts, the widget will automatically default to French if you choose English or German as display language.
Belgo Meteo only modifies very slightly the way the weather info is displayed by the various providers. If you want to modify colours or background, for example, you will need to modify the css by modifying/adding the belgometeo.css file. Please be aware that this file does not contain all css used by the display. Many css rules are left untouched and are coming straight from the providers. You can overrule them by specifying your own css in the belgometeo.css file.