yeah..if you already are deep in to the game with you char and the world it is good to be careful not to somehow ruin your playthru.. but in my exp. mods like this are safe, in worst case they will just not work anymore, problematic ones are those that change your inventory
and if not updated can lead to "broken save" lost of goods..
Mods like this (here is another one "Floors are Roofs") that you talk about is easy to test,
install the mod make a new char and test it in a new world..your main save will be safe.