I would not use that giant rack due to the two point fixing system, two points allows rotation into the front wheel if you hit a bad bump or bags are too heavy....

I have a salsa down under lowrider front rack. Same as the picture below (googing it seems they make two types).
You need inside and outside mid-fork braze ons, and a specific distance from lower braze on to the mid fork ones (at least 155mm I think)
When it is mounted it is rock solid.

Any rack that doesn't go over the front wheel should have three fixing points