If you've been to a millennium event before they are using those removable poles to suspend the netting from. The inflatable boundary is just around the EXL X-Ball field, no others. The netting is then set 1-2 meters back from the boundary, just like normal fields.
There is netting put up infront of the coaching boxes, they use a section of fencing for that. Its only about 3 meters wide and about 1.80 meters tall