Scroll down and on the right.

https://shop.pacifictoolandgauge.com/

This is what is says on the Midway site.
No mention of Centerfeed, Staggerfeed etc. I am just assuming these are centerfeed, but will know for sure tomorrow.
Of course I have 2 stagger feeds.

NOTE: This is designed as a drop-in for most BDL- style trigger guard inlets. However, due to variations in stock manufacturing, some minor inletting (can be done with sandpaper in most cases) may be required.