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No, the Agency Arms Agency Optic System AOS Optic Plate is designed for a slide with the Agency Optic System (AOS). It is not compatible with the factory optic cut. The C&H Precision Weapons Optics Adapter Plate (linked below) will adapt your P320 slide to accept optics that use the Acro footprint.
https://www.opticsplanet.com/c-h-precision-weapons-optics-adapter-plate-sig-p320-x-series-legion-w-romeo1pro.html?_iv_additional-features=aimpoint-acro
No. This plate is specifically designed to work with Agency Arms P320 slides and does not fit factory OEM Sig slides. The Romeo Zero will actually fit your P320 slide, but it will have space on all 4 sides of the optic which is not ideal and requires the screws to do all the work of holding the optic to the slide. My recommendation would be to purchase a larger Deltapoint Pro footprint optic such as the Sig Romeo 1 Pro, Eotech EFLX, or Leupold Deltapoint Pro.
Yes, the Agency Arms Agency Optic System AOS Optic Plate will fit to your existing Deltapoint Pro optic cut and allow you to convert the footprint to fit the RMR, 509T, or Aimpoint ACRO.
MPN:S-AOS-RMR is designed for optics with the Trijicon RMR mounting footprint. MPN:S-AOS-509TDTF is designed to fit the Holosun 509T. And MPN:S-AOS-ACRO will fit optics with the Aimpoint Acro mounting footprint.
These are not the dovetail mounts. Here's a link to one that will work with that setup.
https://www.opticsplanet.com/evolution-gun-works-trijicon-rmr-sight-mount-1-780-in-aluminum.html?_iv_gun-model=sig-sauer-p320-1