In different places? This results in having to change only exactly one thing to configure the module for another UART from your airframe file, e.g. ```<configure name="HOTT_PORT" value="UART2"/>```
If you don't like a (sort of hidden)default for UART1, and want to require always configuring this explicitly it is probably even nicer.
But as long as you properly document it in the doc section above, a default is fine IMHO.