Hi @alwinkomolong,
Yes, you can use RS2+ as the base and RS+ and rover. Since RS+ is a single-band receiver and RS2+ is a multi-band receiver, this setup will allow you to work with L1 corrections.
As @michaelL mentioned, RS+ maximum baseline is 10km. So if the baseline is less than 10 km, both those setups will give you cm-level accuracy.
When choosing between Emlid Caster and LoRa, you need to also consider 2 parameters: internet connection and environmental conditions. If, on location, there’s a poor internet connection, you would need LoRa, but LoRa radio also requires a line of sight and an absence of radio interference. We have a support tip that explains this question further.