If it is same software https://github.com/matiasdelellis/facerecognition has been using (DLib, King's face model) - I can say it is very, very good! Yes, there can be lamppost here and there, but it is miles ahead of OpenCV haar cascade
Nextcloud is self-hosted solution and there is plugin for it that allows you to recognize and cluster faces (to persons) using DLib: https://github.com/matiasdelellis/facerecognition. This might be close to what you need (while Nextcloud is huge software on its own, it is not best photo management app)
