because your afm is in the cooler pipe you can actually have an atmo bov if you wanted to, so long as its on the pressureised side of the Turbo (duh) and pre afm
At this position the afm hasn't metered the air yet so loosing it to atmo doesn't matter
You could also put a recirc bov here, or after the afm, but a recirc bov is probably best after the afm to prevent reversion and air going backwards through the afm on closed throttle