A private landlord owns the property in their individual name, e.g. Mr Michael Smith.
A company landlord owns the property in the name of a company, e.g. Michael Smith Properties Limited. This is considered a separate legal entity in the same way as a public or private limited company, partnership or limited liability partnership.
When applying for membership, the name must reflect the name listed on the land registry for the property and deposit you are protecting.
If you wish to protect deposits taken on properties both in your own name and a company name, you will need to set up separate memberships.