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Buying domain is not complex task, just find name that you wish to use and bang you got it.
For the RT assessments as well as campaigns, I mostly use namecheap or godaddy & cloudflare .
Just in case, setup the DMARC & SPF record - it looks better when someone checks because it is always more reliable 😉.
Setup the legitimate Wordpress server, blog or whatever with some f.e business related content. When website is created. go to the: https://sitereview.bluecoat.com/#/ and Request Symantec for categorization.
Check following websites for the categorization and after that if the website is properly categorized, you can swap content of the website.
https://www.cyren.com/security-center/url-category-check
https://global.sitesafety.trendmicro.com/
https://www.brightcloud.com/tools/url-ip-lookup.php
https://www.fortiguard.com/webfilter
https://archive.lightspeedsystems.com/
https://urlfiltering.paloaltonetworks.com/query/
https://talosintelligence.com/
https://trustedsource.org/en/feedback/url?action=checksingle