what is the closest the faucets can be installed as it says\"wide\" spread

The width of the spout is 3.94\"/100mm and the cover plates of the handles are 2.17\"/55mm in diameter. Namely, the center to center distance between the two outside installation holes in sinks should be no less than 6.1\"/155mm, and it still requires some space for normal operation. You may do some measurement before figuring it out.