Usage of PublicSuffixes on Cloudflare

I'm considering adding my domain to the publicsuffix.org list for cookie reasons since our customers are going to CNAME their domain to its subdomains, would I still be able to use the root domain itself on Cloudflare, I know if I try to add a public suffix like .co.uk, it says "Please ensure you are providing the root domain and not a TLD (e.g., example.com, not .com)"
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