How do I install SSDT 2012 on top of Visual Studio 2010 SP1

Unfortunately, our team is still supporting SQL 2012 with VS 2010 until the end of the year when we will finally be moving to SQL2016 and VS2017. We just got new laptops with Windows 10 and the support folks installed VS2010 but don't know how to get the BI tools to install on that. We use TFS2010 for source control right now (going to DevOps later this year) so I have to use VS2010 for that. I downloaded and install SSDT 2012 but that installed on the VS Shell which is not connected to TFS. Any ideas on how to solve this mess?