For what its worth, I try to treat supervised transformer secondaries the same way as I services.
I would allow up to 6 disconnects per set of conductors, however I see very little reason not to have a single disconnect per transformer.
So,
Is this location supervised?
Do both of these transformers feed the same building?
Is there a good reason to have multiple sets of supply conductors per transformer?
What answer do you want, lots of disconnects or just 2?
And even though it does snow down here, I occasionally miss the +250" up nordth dere.