I have a "sanitize" feature on my DW. This approach will be tried this weekend.
A friend of mine swears by putting PBW into the soap dispenser, doing a full wash cycle, full rinse, and full heated dry with the "sanitize" feature on, then he pulls the bottles off the rack one by one while filling over the open door of his dish washer.
His bottles are clean, sanitized and the mess is contained.
I think he is a genius... but I have had issues with my dish waster leaving gunk in my bottles from time to time. I suspect that my issue is due to being on a well with hard water... and that has reduced the effectiveness of my dish waster to remove food particles from previous washings. Hopefully your washer will perform!
Also, in my racks, I cannot get 48 bottles to fit... so doing a full 5 gal batch is an issue.