[ovirt-users] Best Practice Question: How many engines, one or more than one, for multiple physical locations

Hello all, I read with Gluster using hyper-convergence that the engine must reside on the same LAN as the nodes. I guess this makes sense by definition - ie: using Gluster storage and replicating Gluster bricks across the web sounds awful. This got me wondering about best practices for the engine setup. We have multiple physical locations (co-location data centers). In my initial plan I had expected to have my oVirt engine hosted separately from each physical location so that in the event of trouble at a remote facility the engine would still be usable. In this case, our prod sites would not have a "hyper-converged" setup if we decide to run GlusterFS for storage at any particular physical site, but I believe it would still be possible to use Gluster. In this case oVirt would have a 3 node cluster, using GlusterFS storage, but not hyper-converged since the engine would be in a separate facility. Is there any downside in this setup to having the engine off-site? Rather than having an off-site engine, should I consider one engine per physical co-location space? Thank you all for any feedback, Matt