I answer my own question... :)

The power cables supplied are only 1.5m long.... can be a bit tight, at least 3m would be more appropriate for this kind of product. But you can get any power cable of 3m or 5m and the installation e.g. with feet on the right and left of the sofa and a power bar under the sofa should work without problems.

If anyone can give me a tip for the feet (they are only available from third party manufacturers, as according to Samsung support staff the demand is too small for wall mounts or feet :)), I would be very grateful!