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There is an ISO standard for bicycle luggage carriers; ISO 11243 in case you want to purchase it and read it at your leasure. It basically involves mounting a rack with the max specced weight and swinging it around a bit. It specififcally does not apply to removable bags, so I think most companies would not bother applying it to 3-pack mounts on the side of the fork.
However, if I had a fork with 3 mounts on each side and one at the crown, I would feel perfectly fine attaching a rack loaded with 5kg if it attached to at least one hole on each fork leg and the crown. I wouldn't expect a warranty if I pulled out the threads though.
I'm not sure what makes a fork rated for a front rack or not tbh, can the carbon experts chime in?
I'm not sure if the Fairlight one can take a front rack either, and their website is broken for me most of the time, so I can't check.
Spork, Enve Adventure, the one by Allygn (and I'm sure many others) are rated for a front rack, if you're so inclined. Seido also has this one, which is explicitely rated for a lowrider.