Review on NavePoint 19 Inch Universal Cantilever 18 Inches by Andre Stephens

I have a 2 post rack and chose this shelf specifically for the slots on the sides to add another set of spacers to the back of the racks. I figured this would add more stability and help support the 55lb receiver I was planning to put in there. When it arrived there were no slits on the side. The product was NOT what is pictured. I'm disappointed/upset but not enough to send it back. Without them it seems to be holding the phone normally but I didn't receive what I ordered.