How to address analogue devices in a digital world with Teams phone system

Hi, I have a question about this setup.  We are in the process of switching from a traditional PBX to a complete MS Teams voice including PSTN routing.  We won't have any voice circuit in the office.  Everything will be over to MS Teams voice.  Here is the question.  I have a few analog devices that I have to integrate with Teams voice.   How do I achieve that?  Do I need to purchase SBC and ATA?  In the drawing above, I don't have a PSTN provider.  All internal and external calls are going through MS Teams voice.  Any suggestions?

Thanks.