If your photo is accurate, there are 3 relatively independent reversing loops. The Red outside loop and each of the 2 Green indicated loops. AND a possible wye toward the center (the track sketch paths are not perfectly clear.) The yellow marking for planned track gaps would end up with the green reversing loops coupled inside the red loop. I would move the gaps for the Red outside loop to be so that only that track loop is isolated. Then place other gaps to isolate each of the other green loops from each other where they break apart from the turnout exits. This move would best utilize 3 independent A-R units, each powered directly from the mainline feeder bus. 2 separate (green) loops may not be necessary depending on the actual length and planned movement restriction of trains on those staging tracks.
In this manner you can add independent track occupancy detection on leads to these 3 areas after each of the A-R units if desired.
The wye in the center also needs to be carefully looked at for reversing issues. It creates a very short reversing area where a loco or train can enter from the main line, go through the wye and return to the mainline in the opposite direction. ie - a 4th reversing loop independent of all others. This in itself may require yet another A-R unit with track gaps placed to prevent one A-R area from being adjacent to another. Knowing or restricting train length through this path will be paramount for success
Can you quantify any restricted movements for future trains at this end of the layout?