WARNING- These tiles aren’t packed well and come scratched up at pressure points.  We tried multiple tile specific products to remove scratches with no luck.  My husband frantically put every product we have sitting around on them, and low and behold- WD40 somehow made those scratches completely vanish.  
We used some self leveller on the floor prior to installation, and a dark grey grout.  After the initial scare that they were unusable, the floor turned out great.