SSRS 2016 Scaled Out Deployment in 2 Data Centers

Is it possible to configure SSRS 2016 in a scaled-out configuration across multi-data centres that are geographically separated?

The SQL Server instances will be configured with AOAG across the 3 nodes and 2 data centres and the SSRS will be scaled out in a similar way.   SQL C would be a manual failover, whereas SQL A and B would be auto.  I've put together a simple diagram to try and explain it a little better.

If anyone can confirm that what I'm thinking about is possible and also would it be possible to have SSRS C as a standby so that it's not used unless failover to DC B is initiated.

Or would it be simpler to copy SSRS encryption key over the SSRS C and manually configure to point to the SSRS AOAG databases in the event of a failure?