It looks like these are intended to produce only 10 l of beer. These contain dried malt extract rather than the cans of liquid. The site claims the kits include the hops in hop bags that are then vacuum sealed. It appears that if you want a 20 l batch, you will need to use two kits, or else the hopping will be quite off. I cannot determine if the kits include a sachet of dry yeast, as their elaborate instructions give information for making a starter from dry yeast or using an appropriate Wyeast strain. Can you tell from the package whether yeast is included?
The Furioso is a blond tripel, while the Pálido is a wheat and the Dorado a normal blonde. Depending on your level as a brewer and the availability of ingredients, I would think you could make a pretty decent Belgian on your own. The yeast is typically what gives these beers their character, so if Brewferm does not include a high quality strain, these kits might not be very special.