After months of research and development Murano Mobilia achieved to create a transparent mirror flooring which is able to make every floor reflective. This flooring system has different sizes of planes you can place over your own floors. Please note, this is a MOD which does overwrite your mirror material but doesn't affect the other mirrors in your game. The floors can be easily found under mirrors. If the floor doesn't reflect, please enable reflections in your game settings. Other objects shown in picture are not included.

The updated floors at TSR need NO expansionpack to work! I'd like to thank Numenor for his assistance with this!
And there are now also reflective walls! Check them out at TSR!