Mutiple domains with similar SEO

[prestigeluxuryrentals.com]

ok we have one main domain about our company which is about renting luxury and exotic cars. (PrestigeLuxuryRentals.com). We own other domains with similar keywords,meta,etc on the URL and SEO For example, we own domains like exoticcarrentalorlando/exoticcarrentaltampa, with same background and design as main site but, we have different content than main site to avoid duplicate. Keep in mind, all the other domain we own, all have same template with our companies name on it but, it doesnt have any content or link that pertains to main site. is this a problem?

[simplycary]

It's not a problem, it's just a little bit of a wasted effort. First, EMD's have less of an impact as they once had - so rather than trying to game the SERP's with the micro-sites - you can just kill it with local content on things to do once you rent the car. Think of these other sites as opportunities to create an umbrella of related terms to your main keywords - with links back to your money site.

Also would 100% differentiate the layouts for each site - the more unique each site - the more value your links will have within your network of websites.