The new Romeo 1 Pro is the same mounting as the DPP. Just some added information. So it will also mount directly to the slide, But you will have to figure out the correct front sight height to use the notch in the RDS. I found this site the other day when looking at what RDS mounts are the same. Some good info here.
https://optics-info.com/footprints-on-red-dot-sights/
Good video, explains the why of the plate for the RMR.Watch Tony maybe it will help (around 24m). The reason for the plate in the DUO system is not because of height of the RMR but because of the bolt pattern of the Trijicon sits further out to the sides then the DPP. The other reason is the more holes you drill into the slide the weaker it becomes.
Back to the 2nd part of my question- does the DPP sit lower than the RMR requiring the adapter plate? Or, is it a wash because of the DPP's taller height vs the RMR?
BINGO! Thank you. Wow, so it looks like the RMR+plate is not as tall as the DPP sans plate. Would not have guessed that.Buck just posted this photo to his Instagram Story... looks like it may answer your question