Edit to add the backstory: I had a shooting acquaintance put a Holosun 507k (RMS footprint) on his M&P using an adapter plate, so I figured there must be something that would fit my spare Sig Romeo ZERO. Sure enough...
I had an extra Sig Romeo ZERO red dot from my P365XL where I swapped it out for a Holosun 507K. I also had an extra PSA Dagger RMR cut slide ($120 for a complete RMR cut slide, hard to pass up). I figured, hey, someone out there is making an adapter plate for RMR footprint to RMS footprint (which the ZERO fits).
Sure enough I found Corded Arms made one. After some digging I could not find any decent reviews that I trusted. I did find their physical location on Google maps and connected the business there (Schultz Precision Rifles) with them. So I made the leap and bought the adapter plate for $49.99 + shipping.
It arrived today and I installed it. It was super easy and mounted the ZERO perfectly. There is no change in POA vs an RMR. I'm a fan. Part of my reasoning is the Dagger slides are very narrow and both my 507C and Swampfox Liberty hang over the side by a lot. The ZERO sits perfectly and is very slimming.
^^ Holosun 507C ^^
^^ Sig Romeo ZERO ^^