Your SPF record will depend on the datacenter you are on. You can check the datacenter you are on by looking at server hostname in the DMARC reports and correlating the DC number to this list.
To enable DKIM on your SAP SuccessFactors instance, please reach out to SAP Cloud Support team (under component LOD-SF-PLT-SEC) with the following information provided:
Company ID;
Datacenter;
Your mail domain details;
(Provide a full list of the email domains used by users - there may be more than one).
SuccessFactors can also forward outgoing emails through a customer's own SMTP server(s). They only need:
the condition (recipient domain);
the customer's SMTP server's IP and port;
SMTP auth user and password if needed.
Don't forget to create a free OnDMARC account to test your configuration!