To make them always pop in the same location change line 2 of eq2ui_inventory_loot.xml as below (
bold is what to add). 100,100 is in the upper left corner. Bigger #s move it down and to the right. Save the altered file to your mods directory or it'll be overwritten when you patch.
<Page Activated="true" eq2opensound="ui_window_inventory_open" eq2usescomwndcontrols="true" Location="100,107"
OnShow="Location=100,100"MaximumSize="1000,1000" MinimumSize="346,250" Name="Loot" ScrollExtent="346,250" Size="346,250" UserMovable="true" UserResizable="true" version="2.0.0">