Another rack some might find worthy of consideration is the Pass and Stow (
https://www.passandstowracks.com)
These are a painted cro-mo steel rack that was getting some positive comments in the MTBR forum
They caught my eye a few years back when I spotted them, I think, in the Surly commentary section of said forum.
My decision to pass on them was due to living coastal and not wanting to deal with rust and scratches on a work surface that would see plenty of action.
I'm very happy with my stainless Tubus racks but do keep returning to look and admire the racks from Pass and Stow.
Anyway, thought posting another option couldn't hurt, despite them not exactly being a low-rider as they can haul a pair of panniers