Solid tutorial!
A side note: After I changed my lnd.conf file, restarted, and tried to add the watchtower, I came across an error that said this:
[lncli] rpc error: code = Unknown desc = wallet locked, unlock it to enable full RPC access
To fix it I just ran the following:
docker-compose exec -it lnd lncli unlock
Then ran the command to add the watchtower again.