Mikrotik with RouterOS v7 with WireGuard or ZeroTier were the first things I thought of, but it might be a a bit premature for a production environment. In a year, I'd have no problem recommending that.
From: "Ander Punnar" <ander@kvlt.ee>
Cc: nanog@nanog.org
Sent: Thursday, February 10, 2022 2:04:57 PM
Subject: Re: VPN recommendations?
On Thu, 10 Feb 2022 10:55:40 -0800, William Herrin wrote:
> My understanding is that Wireguard is software available for general
> purpose operating systems. I specifically need a set of hardware
> network appliances.
MikroTik (hardware) RouterOS (software) version 7 has WireGuard:
https://help.mikrotik.com/docs/display/ROS/WireGuard