Addon Domains in the same hosting account

By buiding PBN i try to spread all the pbns at different hosting providers. At every hosting account i host only 2 pbns, usually the first one is the main domain the second is an addon domain. The both databases are in the same tree in cpanel. Do you think Google can see that both domains are related from the same account? Usually one IP can hold more than 1000 sites, my 2 sites are from the same account, how can I handle it so that Google thinks the two sites are just accidently on the same IP without relations?

No Google can't track that both are from same account just because they are from the same Cpanel but Google can figure that out from both the sites being from same IP. Like you said there maybe 1000s of other sites hosted in that IP so as long as both of your sites are not extremely similar or linking to the same set of sites always, you shouldn't face any issue

I might be wrong but as far as I can recall - Google is also looking at whois information, do the two domains have separate whois information? If not - that might also be something you would need to do, using different owner emails and details for your domains. Same IP and same whois information might put up a flag somewhere. Rather be safe.

Google wants one domain from one cpanel to indexed well.You need to keep only one domain as your main domain and forget about the addon domain.

Google can't see how many domains are in one account/Cpanel, all they see is the IP and nameservers. Especially on shared hosting with shared IPs, having 2 PBN domain per account is totally fine. Even more is not a problem at all as long as they don't all link to the same money site.

So, 20 domains on 10 IPs linking to the same money site is certainly an unnatural pattern. Also depends on the overall backlink profile, the more links apart from the PBN, the less obvious this pattern becomes in the overall picture. 50 domains on 10 IPs with only one site from one IP linking to the same money site, no problem.

Max 2 domains per IP / account and you're good to go. Just make sure you don't interlink it to each other. And make random things like using different theme, unique content, unique whois, etc.