Servicing more Home Assistant sites

I am setting u a service for multiple HA installations on different sites it is for Commercial use of SaaS. i was considering:
• Home Assistant
• Tailscale
• Nabu Casa
• Samba Share
• Backup addon

The big question is if its actually nessersary when i can create remote access in HA cloud?

Nabu casa is easiest.

Tailscale will require setup per device accessing HA