[Celacena]

easy to fail

if you are seen - even if the people don't react - when you report back Imalia has a gob on her and bawls you out.

if you can bite-stun from behind, then you can rely on the person being unaware - I think that I have passed the mission doing that BUT if you are detected in the split second before the bite, you have failed.

Auspex can be handy here, as you can see where people are and where they are moving to. wait for the woman to go into the kitchen then plant the lounge cam - then sneak into the bedroom and plant the one in the bathroom - you may need to hide whilst boyfriend telephones a llama agency then goes back to the lounge - then nip across to do the one by the bed then get behind the screen and activate using the laptop.
don't forget to sneak out too.

I sometimes put the bite on the woman in the kitchen and the guy when he is taking a leak, but it is risky.

If you enjoy Thief and Splinter Cell - then you probably have the patience for this mission - but it DOES take patience waiting for the characters to move to convenient locations.