I run 3 small mandrake squads and if a go first I generally will infiltrate them as close as possible and then move / run them up to make a screen as close to the enemy as possible.
They are a pain to take out with shooting, but easy to deal with close combat and generally will keep most of the enemy force in their deployment run a turn longer than they want.
But here is the best part, if the enemy decides to take a squad out with cc then they whatever they used to kill it will be clustered up (given only D6 inches to move after piling in), so if 1 or more of your Razorwings come in turn 2 you have a really nice group to drop your missiles on.
EDIT: if I go second the mandrakes always outflank and this tactic doesn't work at all just an FYI
The worst sort of protection is confidence. The best defense is suspicion.