I think anywhere is fine, just so long as there's actually an option for it. The first instance that the particular logo is used is fine too.
selinadee's forum posts
It amazes me that there is no creator tag for comic logo designer, when the logo is such an important part of the cover design as a whole. Many comic companies spend a great deal of time hiring and briefing designers to create dynamic and relevant logos that contribute to the prestige and branding of their titles. Designers such as Chipp Kidd, Rian Hughes, Steve Cook, John Workman and Todd Klein himself. In fact Todd Klein has begun a well informed study of Comic logo creators here: http://kleinletters.com/Blog/?page_id=2709
For such a well designed and informative website, I think the exclusion of this creator credit has been an oversight by Comic Vine and I hope that it will be considered as an essential update.