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Hello, we have 3 separate websites and domains. Industry directory websites Industrialdomain.com DA:62, 8yrs old Medicaldomain.com DA:45, 8yrs old and Hosptalitydomain.com DA:24, 1yr old These sites are cross linked site-wide via footer links and the sites flow a substantial amount of well converting traffic between each other. How does Google see this? Could we place the links in a better position than the footer? The links should be site-wide as we receive many deep visits to these sites from organic and PPC sources. Our traffic is down 20% post penguin, we are going through the backlinks now and weeding out some iffy links but the site has never been forum spammed or anything even close to that. One other thing is that they are linked to with anchor text type links
For example, 
Hospitality Equipment  
Medical Supplies & Devices 
Industrial Directory It may be best to start of just linking with an image.