How do I create the '@' A/AAAA record for my domain?

Many services have you create the base record for your domain (e.g. example.com) by naming it @, however our DNS Manager will create the same record if you leave the hostname field blank.

You can also use an API call like the following (this specific one is converted from a script, and has not been tested, but should illustrate the general idea):

curl -H "Content-Type: application/json" \
    -H "Authorization: Bearer ${TOKEN}" \
    -X POST -d '{
        "type": "A",
        "name": "", ##   <--- Leave this blank instead of using '@'
        "target": "'"${LINODE_IP}"'",
        "priority": 0,
        "service": null,
        "protocol": null
    }' https://api.linode.com/v4/domains/"${DOMAIN_ID}"/records

For the SRV Records, It isn't working even when its blank