Minimal Low-Rider Touring Front Rack Recommendations
I've got the Blackburn CL1 you picture or one almost identical.  I bought it for my hybrid and only ever used one side (D lock the other side) and I only got it to fit by cutting off the bar to the inner screw hole.  Now I've put it on a tourer that does have the right screw insert, but none of my panniers fit with that inner bar, so I've cut it off on that one too.  This of course weakens it in the lateral direction, but that's something I accept given that I intend to load it lightly and only use it occasionally. 

Getting the P clips on the diagonal bar to align and grip properly has also been a challenge (not helped by disc brakes and full mudguards).  The bar for the lower pannier clip (anti-sway) isn't very versatile, but I want to put my Altura Morph backpack pannier on there, which is really meant to go on the back.

Overall I only recommend this design if you're prepared to accept a lot of fiddling and modification, but it is light.  If/when I get something new I may well go for one like your top picture for serious heavy duty, or that Tubus at the bottom.