From my point of view the only dual SIM phones which work with rSAP are the many MediaTek phones.
MediaTeks with Android 7 all (?) seem to support rSAP with the stock firmware, the only small restriction is that you cannot choose which SIM card rSAP should use - it's always the first one. My app currently does not work
with Android 7 MediaTeks!
MediaTeks before Android 7 are supported by my app or may even support rSAP with the stock firmware, although I didn't see many. In my app you can choose the SIM card for rSAP.
Samsung Duos and other dual SIM Qualcomm phones basically work with my app, but they usually lose connection to one or all SIM cards. Some can be restored with the Reconnect Plugin from this forum, but others may require a reboot each time after leaving the car