Montage riddle

Hi everyone. I have a project for which I have not found an elegant solution, and I would like to ask for your advice in the following situation. I want to install a decorative wood panel all the way up the wall from the baseboard to the ceiling. I can't screw it on the front directly, but it is about 1 cm thick, which allows me to install some fasteners on the back side. There is some space (1-1,5 cm) between the panel and the wall, so just gluing it down will not work. The construction must be stable, I tentatively estimate its weight at 20 kg. The wall is made of concrete. I would be very grateful for your ideas. Thank you for reading!