I use Carrd for the landing pages for many of my higher value one and two word .com domain names. I don’t know the exact number of landing pages, but it’s probably more than 25. I’ve created and modified a few similar but different versions of the landing pages with the goal of driving traffic to the inquiry form on Embrace.com.
I have owned Receivables.com for a year or two. I have used a fairly simple landing page created with the help of Carrd, figuring prospective buyers would know why they want it and submit an offer via the inquiry form.
You can look at a screenshot of how Receivables.com has looked for quite some time: