Buy a tag and become a registrar[1] with your target TLDs. Try to colocate your servers with the registry you are targeting. This gives you root level access to the registry and you'll have lower latency than a lot of the dropcatchers. It used to cost about $100k a year to get a .com tag, but I'm not sure nowadays. The fees vary by registry. Every time you setup a dropcatch or use a registrar, you are adding an extra service between yourself and the registry where the domains are actually registered.

[1] https://www.verisign.com/en_US/channel-resources/become-a-re...