It is also feasible to run some sections with both rails directly supplied from your track bus - as long as the k rail is isolated from sections supplied by the RS8. These sections obviously won’t be ‘monitored’ but will free up outputs from the RS8 to allow you more monitored blocks.
The voltage supplied by the RS8 is slightly lower than that supplied directly but there is a way of dealing with this if it causes a problem.
The actual number of, and location of, monitored blocks is another issue altogether.