+1 @Gamerseo I also prefer to acquire links manually and have full control over the links/process. If buying service, I'd make sure they will provide full report where an...

One more piece of information is the Nofollow attribute, it is only a recommendation and such a link can act as dofollow.

Backlinks should always be sourced manually.

Here is a list of such a service providers, https://www.fiverr.com/gigs/dutch-backlinks

Then it becomes a business requirement to have separate websites.

Then it becomes a business requirement to have separate websites.

Also, if they are 2 completely different businesses?

Besides the above mentioned, use such a content on your webpage so that people can link your webpage. This works wonderfully.

I recommend to maintain only one website rather than multiple websites. With one SEO effort, benefits will be shared with all the pages on the website.

When a website links an another website then the linking website passes the link juice to the linked website irrespective of whether a link is declared dofollow or nofoll...