Main Remote Desktop Manager clients and Devolutions Server are written using the .Net platform, which means that the capabilities are often derived from .Net libraries themselves.
As such, supported availability groups are a feature of the database driver used. All types are therefore supported:
Multi-Subnet Failover
Application Intent
Read-Only Routing
Multi-Subnet Failover: Faster Single Subnet Endpoint Failover
Multi-Subnet Failover: Named Instance Resolution For SQL Clustered Instances