I'm looking for clarification on the extension capabilities of the main repeater (RR-MAIN-REP-WH). I understand there are two options. First, we can use aux repeaters (up to four), and they can communicate either via RF, or wired link via RS485, correct? The other is to use the wireless repeater (L-REPPRO-BL), which can only be connected via RF, and can be used in both RA2 Select and RadioRA2, correct?