Yes you can fix an apron to this and dig it in if you wish. It depends on what you are trying to keep out. Chicken wire dug in and fixed a couple of feet high on the stock net will discourage most small predators. Hardware cloth would last longer and provide better security assuming half inch...
This is fine. If it's put up properly. It seems rather expensive for Stock Net which is what it is basically.
The thing about Stock Net is it is meant to be hung. It is not a rest on the floor and staple to posts type of fence if you want t to be properly effective.
Here is a picture of a hung...