You can monitor a Capacity Plus system with a Moto radio as long as the radio has the Capacity plus feature either enabled (some radios have it free) or purchased if its not free.
If you do have a radio with it, and your familiar with standard DMR, the only additional steps needed are to program a channel pool. You need to know the logical order for this.
Then you create a Capacity Plus Voice Pool, then create a Capacity Plus Personality. (before all that is making the Capacity Plus Contacts and RX Groups, do these just like a normal DMR type but its under its own heading in the software).
When you create the Capacity Plus personality you have the option there to select RX only. IT works well.