I did it!
And the winner is: I'm an idiot. Just some error with cut/pasting from the code available in the thread I linked.
Anyways, if anyone wants the final product here it is:
Lua Code:
EVENT_MANAGER:RegisterForEvent("MoveInteract_OnLoad", EVENT_ADD_ON_LOADED,
function(code, name)
if name ~= "MoveHoldToInteractPlayer" then return end
ZO_PlayerToPlayerAreaPromptContainer:ClearAnchors()
ZO_PlayerToPlayerAreaPromptContainer:SetAnchor(BOTTOM, ZO_PlayerToPlayerArea, BOTTOM, 150, -500)
EVENT_MANAGER:UnregisterForEvent("MoveInteract_OnLoad", EVENT_ADD_ON_LOADED)
end)
See attached SS for results. It's pretty damn close to the NPC version in location now.
Now, if I can just figure out how to make it editable in game, I'll have a real winner and maybe I'll post the addon for others that may want it! (I'll take any pointers if you want to take a moment to share)