We have a customer in Sri Lanka who uses it. They are banks with multiple branches and use the Palo Alto firewall to connect them in local area. It's also used to connect their local area network and servers. Basically, it's a standalone firewall for their setup.
Another customer is Maliban, a textile and garment company in Sri Lanka. They also use a standalone PA-800 series firewall. I haven't personally enrolled it, but I can manage it since I have experience working with the VM version in a VMware setup. Palo Alto is not only a hardware product, it can be used in VM environment.
Additionally, there's CELSI, which has a PA-5500 series firewall. I enrolled that one when I first started my current job.
Overall, our enterprise-level customers mainly want to secure their bank branches, local networks, and websites. They primarily use standalone firewalls, and I haven't had any issues managing them so far. Even though I haven't personally enrolled all of them, I'm confident I can handle any recommendations or configurations needed.