I have three sections of this track. Two are on a workbench, on the front edge and right edge, installed at 90* to each other. They are through bolted, as recommended by Kreg (not as difficult as some have said). They are ROCK SOLID!
The third section is on another work bench and I use it sort of like adjustable bench dogs. This was after I found that the clamp you show does not fit generic miter track because the bolt head is a unique size/shape.
In each case they are mounted flush to the table top and do not interfere with other uses of the workbenches.
I haven't found much to complain about with most all the Kreg products I have purchased (and I do not work for Kreg).