Engine position and prop reconnection

[jorgeinmiami]

Sometime in the next week or so I will be installing a Yamaha 200 HPDI on my 20.
No bracket straight on the transom.

Question is how high or low do I need to mount it?

I have heard to get a level and use it to see where it should land.
And has anyone mounted a Yamaha 200 and what prop size worked out best for them?

And any other advise would be appreciated