Greetings!
In the first case, the bolt head and washer go into the track, and the bolt comes up through the floor.
In the second case, the toggle bolt anchor goes into the track, and it’s width will grab the track and also prevent it from turning. You drill holes in your plywood in line with the tracks, put the bolt through the plywood, and screw the anchor loosely onto the back side. When you put your plywood down, you make sure the anchors go into the tracks. You might have to rotate them slightly if the get out of line. Then you just tighten the bolts and you’re good to go. Pay attention the bolt lengths. You want them long enough to go through everything, but you don’t want them so long that they bottom out on the track bottom before they’re tight.
Cheers!