Make sure 'Allow Ethernet Bridging' and 'Do Not Auto-Assign IPs' are enabled
sudo zerotier-cli set <netowrk id> allowManaged=false
sudo nmcli con add type bridge con-name br0 ifname br0
sudo nmcli con add type vlan con-name eno1.20 ifname eno1.20 dev eno1 id 20 master br0 slave-type bridge
sudo nmcli con add type tun mode tap ifname <zt interface> master br0 slave-type bridge
sudo nmcli con modify br0 ipv4.addresses <zt ip addr>/24
sudo nmcli con modify br0 connection.autoconnect-slaves 1