Thru Hull Placement

[Pajaro]

I have a 1985 v20 center console with outboard bracket. The transom was redone when the bracket was installed by previous owner. The thru hulls for the in floor baitwell and cockpit drain were sealed. Currently the cockpit drains into the bilge. Want to change that by installing Rabuds to allow the drainage. There does not seem to be much room for error in placement to allow drainage but not be below waterline. Have any of you been through this? Anyone have good transom pictures with drains in place? Any help on positioning the holes is appreciated.