OpenWRT

The OpenWRT pacakge is not built or maintained by ZeroTier Inc.

https://github.com/mwarning/zerotier-openwrt/

See their wiki for instructions for routing between your ZeroTier network and physical LAN via OpenWRT

https://github.com/mwarning/zerotier-openwrt/wiki

OPNsense

Also not a package built or maintained by ZeroTier.

https://docs.opnsense.org/manual/how-tos/zerotier.html

Teltonika

https://wiki.teltonika-networks.com/view/ZeroTier_Configuration