This [VINTCON Optics Adapter Plate for Glock 19 17 MOS, Compatible with Holosun 407C/507C/508T Trijicon RMR/SRO Durable] seems to work fine, and it fits to get my Trijicon RMR onto my G19 gen3 MOS slide. It is low cost, and from a no-name brand; so I am a bit skeptical about its durability. But so far, it is good. Kept my zero. I recommend putting a visual marking on the screw so you can see if it backs out. I will report back later after I put some more rounds through it and see if it still keeps my zero.
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