Sorry if that sounded a little harsh, I was in a hurry this morning.
When you get the mount, you will see how tiny the little set screws are, fore and aft. The mount itself is quite rigid, so you will get to see for yourself how it fits. If the mount itself isn't very tight in the dovetail, it will move slightly after a few hundred rounds and the zero will shift. I have had that happen is why I was so adamant about getting a tight dovetail fit, even if you have to use some shim stock. I think I have used shim stock, either 5 mil or 10 mil on about 1/2 of the dovetail mounts I have. I have also had to file the bottom of the mount some to get the mount installed.
Having the zero shift suddenly on you will take all the fun out of having a red dot on the pistol. I don't want anyone to have that experience. You will love the red dot after you get used to it.
You can always have the slide milled later if you want a little lower mounted sight. For bullseye, the dovetail mount works fine. For run and gun, I like the milled slide, but can live with the dovetail if I have to.
Joe