When I previous asked which rack was used, that question was in part to assess how wide the panniers might be apart from each other since the length of the Rack Pack was pertinent to width of panniers on the rack.
I was looking for something else and found a photo that I took eight years ago, at that time I had my old Surly rack on my Rohloff bike instead of the Tubus Logo. The Surly is a really wide rack, you can see how wide apart the panniers are. The panniers are far enough apart that my Carradice Nelson Longflap does not sit on the panniers the way that it does with my Logo.
Bike was leaning on the kickstand, I intentionally rotated the camera to match the lean, thus everything else looks leaning.
Same panniers and same Nelson Longflap on my Tubus Logo EVO on a different bike below. Panniers are a bit closer together and the Nelson Longflap is supported better on them.
And the lower mounting point on the Logo instead of up at the top of the Surly rack is also apparent for pannier height.