Depends how bitter you want it, but with citra and mosaic I'd hold half each back for a dry hop like surfingobo says.
Looks very like my regular NEIPA if you skip the Amarillo.
I've never had issues just chucking it in the fermenter. Last time I sprinkled it on top just to see what difference it made but as far as I could tell they took off in the same amount of time.