Senior Member
Join Date: Aug 2010
Location: Madison, WI
Posts: 11,209
Bikes: 1961 Ideor, 1966 Perfekt 3 Speed AB Hub, 1994 Bridgestone MB-6, 2006 Airnimal Joey, 2009 Thorn Sherpa, 2013 Thorn Nomad MkII, 2015 VO Pass Hunter, 2017 Lynskey Backroad, 2017 Raleigh Gran Prix, 1980s Bianchi Mixte on a trainer. Others are now gone.
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Lower hook does not matter that much, aim it in any direction that works well when you mount the pannier on the rack. If you lie the bike down on its side, the lower hook should hold the pannier to the rack. The upper hooks are the ones that support the weight of the pannier in normal use. Thus he upper hooks are the ones that are important to get them attached well to the rack.
I have some shopping panniers that do not even have lower hooks, as they are not that important.