If you have never used under floor heating before in your life, there is a pretty good chance that you are in for a huge shock of the pleasant variety. This is because of the fact that under floor heating is the sort of thing that can more or less change how you perceive the pursuit of warmth, which in many ways is one of the fundamental pursuits that is endemic to the wider human experience. Not having used such a mechanism in the past might lead to you asking questions with respect to how it works, and one such question would be whether or not you can put your furniture on it without it getting damaged.
It might make sense that something from https://www.123vloerverwarming.nl would damage furniture since it is a heating source, but the truth of the situation is that this is not actually something that you need to wrack your brain stressing out over. The heat that these under floor heaters create is not high enough to do any form of damage at all, and since the heat is spread in such an even way it would at most just make your furniture a bit warmer than it would have otherwise been.
The whole point of under floor heating is that it can be used as a regular floor, and that means that you should be able to place your precious furniture right on top of it without a care in the world. However, the fact of the matter is that you should be careful while putting rugs or carpets on floors with heating underneath since this can trap the heat and cause problems.