Prioritize verifiable IP provenance, dense coverage in your target markets, and stable latency backed by a clear SLA. Look for explicit rotation and stickiness policies, profile-aware routing controls, and exportable telemetry. Enterprise readiness matters: clean REST APIs, RBAC, SSO/SAML, detailed usage reporting, and incident postmortems that drive measurable improvements. With the right partner, multi-profile QA scales smoothly, cross-geo insights become routine, and teams ship with evidence—not guesswork.