Endnote placeholders are usually customizable to wherever you want them to be.
How to do this? Can anyone enlighten me?
I'm not sure if you're asking this question from a aesthetic design perspective or from a functionality perspective.
Either way, I guess this link should give you some clarity: http://carijansen.com/2010/11/13/footnotes-and-endnotes-with-indesign/
Also, there is already a thread in this forum that should answer your question - http://forums.adobe.com/thread/681891
You may also want to review these links for cross-referencing that cuts down lot of time which came out in CS4 by request:
Message was edited by: Sudarshan Thiagarajan Reason: A couple of more links to detail cross-referencing feature