You can throw your money after imaginary “requirements”, like milling, drilling, and tapping the slide, and no doubt such work makes for a nice end result, even a superior one.
It's not imaginary to want your gun to mount in the same position as other guns not equipped with a red dot. Hence having the RDS mounted as low as possible.
This is the struggle when people try them. Their mount point has to be adjusted from where they are used to. Possibly undoing decades of learned behavior.
Ive got a couple that use a mounting plate system in a milled recess (glock and 1911). If I had to do it over again. I would have the slide milled specifically for my RDS.. It makes that much difference.