On win2012 you can run your app(s) like services, without problems.
You need to install it under your account that is provided with full rights and privileges. And one more: If you are using one account to lets say, log into server via RDP session, DO NOT use that account to install your services app.
I have couple of apps running like server, on: Win 2008 , Win 2008 R2, Win 2012, Win 2012R....
If you have questions, just call.