3L.io are doing good even random .IO. you should list them on a landing page.
Why limit yourself?All my names have landing pages with my email and phone number on them, plus link to an offer page. I just don’t list on many marketplaces. Only sedo (+partners), uniregistry (+GD and Aftenic) and Dan.
Epik is in my to-do list but only for listing on their marketplace). I am currently in the process of transferring all my .com .net .org and .info to Sav as it’s far cheaper to keep them there and all ccTLDs (like .co.uk) to Dynadot. I want to use dynadot marketplace for internal domains and auctions. My idea was using uniregistry parking but linking from the landers to offer pages on Sav marketplace as they only charge 4% commission at sale.
Here is a true story, his friend lost the deal because of Sav.com as he had that name with them.