[fishej]

This can be dangerous.

If you use an ordinary non-power-blocking satellite splitter, then one receiver at a time could power and operate the motor and power the LNBF. The problem you can get into is when you (accidently) leave both receivers powered on and connected. They can then fight over which will provide power and how much. Eventually, one receiver will probably lose, usually in a dramatic way.

With a power-blocking splitter, one receiver must be the master, always on to power things and select the polarization.

A safe and probably acceptable approach would be to use one and only one receiver as the master control for the motor, and install a dual LNBF on the dish to give each receiver its own feed.