Can we add a second DVR to X1

I got new X1 service in June of this year and we 1 cloud based DVR and 2 'companion' wireless set top boxes.

I'd like to increase my storage capacity  - I'm already paying up ($10/mo) for the 'added cloud capacity', so I think I am maxxed out with what I have.

If I understand correctly, the only way  to increase DVR storage is to add a second DVR to my X1 service - but when I called to do that, I was told that isn't possible.

I would like to add a second DVR and have it 'feed' the existing cloud storage...

Is this possible ?

Thanks in advance!