Hi Robert,
Thanks again for answerring and also for your understanding. I really appreciate that!
I'm new here in Moz, but what I like is the general intention to do things 'as they should be done'. That's exactly what I like to do myself (being a single entrepeneur and webdesigner trying to become better in seo btw).
But I also have to be realistic. If I let the hoster remove all the 'domain pointers' (or how should I call them?) and that would lead to their main site dropping in Google, that would not make them happy.
I'll try to be more concrete then. There is a main site, www.hetzuiden.nl. Doing pretty well in Google for some terms, but they want to do better.
If you look in OSE, you see domains like www.hetzuiden.eu, www.hetzuiden.be and www.vochtweringsbedrijf.nl as linking domains. Low DA, but still. If you visit these sites, you are in fact looking at the main site. Only the domain name stays visible in the browser.
If you visit www.vochtweringsbedrijf.nl in OSE you see backlinks too. Arranged by the SEO guy before me.
All together not impressive, but it could make a difference I guess. Especially because the duplicates are containing the same keywords. or am I thinking wrong here?
I hope the above explanation makes it easier to send me in the right direction
One concrete question: You made it clear that CNAME is not the way to go. Is the 'A record solution' also a no go?
Thanks a lot,
Hans