Having the "Footprints" for some specific optics might allow their lower mounting, but I wonder if the screws securing such optics are on the underside of the rail, thus preventing easy/quick removal in the event of failure, or for any other reason. Most users of RDS/Reflex optics on Minis with "Scout Rails" tend to mount the RDS/Reflex optic much further forward on the rail, this foeward mounting ploint providing better situational awareness vice a rearwards mounting point.
Also, mounting such optics as seen in the pix provided would seem to preclude the possible addition of a "swing-away" magnifier optic to the rear of the RDS/Reflex optic.
Possibly the best thing would be an Ultimak with full Pic-rail cuts as far to the rear as possible, and the sides of the forward part of the rail drilled and tapped to suit various MLok accessory rails. Unfortunately, these changes would no doubt raise the price a bit, but as against that, the machined-in scallops could be deleted.
IIRC, the Amega Ranges scout rail has some drilled and tapped holes on the sides of the rail, but I don't know if they're suitable to the now-ubiquitous MLok pattern of screw-attached devices/short Pic-rails, although Amega Ranges offers some accessory devices designed for their OEM screw holes. The Amega Ranges Scout Rail is considerably higher than the Ultimak, and since getting all Scout-type optics as low as possible is absolutely essential, the Ultimak is generally the preferred rail.
I would caution against obscuring the OEM venting holes in the sides of the Ultimak, as they can be useful in reducing barrel heat. IIRC, some syn stock users have drilled venting holes down the middle of the fore-end of their syn stocks, in order to provide incoming cooling air undeath the OEM heat shield, and which cooling air naturally circulates by convection. User's hand is protected from hot gasses by the OEM inner metal heat shield.
The mounting holes for MLok devices/rails can be added by the user to the Ultimak rails, if desired.
Center-to-Center screw hole dimension for various MLok rails:
MAG406 max overall length of 2.5', Mounting screw center-to-center of 1.2'.
MAG407 max overall length of 3.3', Mounting screw center-to-center of 1.6'.
MAG408 max overall length of 4.1', Mounting screw center-to-center of 2.4'.
MAG409 max overall length of 4.9', Mounting screw center-to-center of 3.2'.
This new rail will require some hands-on use to see how it compares with existing Mini scout rails. Let's hope for the best!