Best red dot position for Ruger Mark IV Target

Hi, I'm buying the new Ruger Mark IV Target released for California. I want to add the new Holosun 507Comp.

There seems to be two mounting positions that people use. The more common is over the ejection port, like this.

https://preview.redd.it/39kimgi612qb1.png?width=892&format=png&auto=webp&s=da7cf6828fb7d823fc6fc8dfb449fd808e1c7ac6

Then there's the more traditional handgun way of mounting it towards the rear, like this.

https://preview.redd.it/y6edjo7c12qb1.png?width=750&format=png&auto=webp&s=5926c163cc58432287a98bd5396eaaa75dab3e27

I'm not new to guns but I am new to 22lr pistols. Only shot one once and it wasn't with a red dot. Which mounting position is better? I want this to be a pistol where I can compete with my friends at the range with the close-range steel targets, and practice quick target acquisition from draw and transitioning targets.