You could record a Deed of Trust to secure your option.
The objective of the article is to show that you can get paid, the seller can sell, AND the agent can get paid a commission IF there is enough equity (meat) in the deal.
Getting an option on a listed property is not to circumvent the agent and their commission ( even though they did nothing to earn it).
Of course, it is much better to get options on properties which are NOT listed. But the article shows that an option can even work on a listed property.
There are lot more details, and documents in the Options Home Study courses.