Submitting ports with required dependencies

I've done some reasearch on this already, but I was curious if anyone
had any guidance on the best way to submit a new port which requires
several other new ports as dependencies?

I can see a few options, and would be interested in what would make
reviewing and potentially giving an OK to the new ports easiest?

Should each port be submitted separately to ports@, with or without
the context that the port is required as a dependency for another port?

Or is it best to submit all patches for all dependency and the main port
at the same time, in the same mail? I assume with patches as attachments
rather than inline?

Thanks!