It’s best to have a star wiring pattern with each point of the star feeding a center rail isolated block, but as a few have already said, try it with your existing wiring. You have nothing to lose.
My layout has star pattern wiring (more or less), but not all of the blocks are isolated. Once in a while I get duplicate signals. EG: I press the crossing soft key and get two longs, a short and a long followed by another two longs, a short and a long. But overall operation is fine.
Black center rail on Gargraves or Ross track is no problem.
