Not any, just those who looked like they would cause throubles when provoked ... You know ... like Githyanki patrol, Duergars on the beach (as far as i know they werent stealthing in first builds), Duergars at Grymforge, all Goblin leaders, ... in short any group that was at least little biger, or scarier than mine.
Actualy when i first time approached the house, i allready killed redcaps, so i kinda "should have know" there is something off ... but no, i didnt position my party there, since conversation started once i entered the house. But also i didnt need to, since one jump from those doors get you to high ground.
As for the lair itself, you start there on High Ground aswell, so again no position needed.
I still dont understand why cant we change Race for our hirelings. Lets us play Githyanki as racist as they trully are!