Add Symbol in IT Architecture Matrix model

We want to cataloguing location of a server (in this context, cataloguing a data center). Our concept is to insert it into IT architecture matrix model beside with the server (picture below). Note that we only want to cataloguing a Data Center without connecting it with the existing server.

But when I checked into default IT architecture matrix model, there’s no Location symbol. 

Is there a way to add it? Because I can’t create a new matrix model as well.