Grip, more backhand than your flat serve grip, so you can pronate up and outwards.
Toss, more behind your head, or atop the back of your head.
Strikezone, lower than for a slice serve or flat serve, so you can swing upwards and outwards at the ball.
Body, arched back, so you present your chest to the sky, allowing you to swing up and out.
Toss height matters less, because what counts is your strikezone, which is lower than for a flat or slice serve.
Stay sideways, swing up and out to your right, if you're right handed.
Aim to clear the net by 3', the slow speed and spin forcing the ball IN to the service court.