Spanning an on-prem cluster across three datacenters

Hello,

Would spanning on-prem cluster across three datacenters make sense in order to ensure high availability?
The datacenters are interconnected using dedicated layer 1, all fiber lines. The latency is minimal. Geograpically the distance is relatively short, in AWS terms we could say they are all in the same region.

From my understanding, that would only be an issue if the latency was high. What about one control node per DC?

Edit: latency is avg 2ms while etcd default heartbeat is 100ms.