I would stick with the k series. 507k is .98” wide, 507c is 1.24” wide.
PCR slide is
So if you go with a 507c (or 407c) you will get 1/4”+ overhang and will likely need to use a mounting plate which will raise the RDS higher. With the 507k you can directly mount the RDS to the slide with minimal overhang.
My Rami slide is about the same width as a PCR

And I don’t feel anything larger than a 507k works well.
Just my 2 cents. I have heard of people doing it but my preference would be for the lower, neater mount. I have a Romeo1 on a dovetail mount on my SP-01 but am planning to get it milled at some point in the near future
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