Where I play my tennis, I"m often banished to serve only into the mid morning 11AM sun, me a lefty.
I have to learn a lower toss, quicker motion.
When I get to serve practice from the other side, facing away from the sun, I normally have a toss maybe 10.5-12' high, which is medium for a contact point just over 9'.
The only real difference is the racket path back from prep to trophy, and easy change from my CrisEverts looking normal motion.
Takes less skill than you would believe, you only have to focus your eyes on the ball height you intend to toss, and it happens right 98% of the time.
As said, the quicker motion is really only effective for surprise on the first flat serves.
Second serves and most spinny serves give the opponent plenty of time to react.