Ok, new edit: This is exactly the problem. For anybody else with this problem do exactly what this comment says:
Place the holo quinn, then place the modern quinn in the llayer you want, then you can take the holo quinn back soo it dosnt bother you. The game take the decoration ''quinn'' as 1, soo you need to put the old quinn to have acces to the new Quinn. Big mistake from bioware, hope they fix it eventually, but meanwhile doing this you will be able to use the new Quinn in your stronghold. He will not be Holo anymore. But he will surely be **** anyway.