Second-hand appliance installation?

A family member gifted me his older but still pristine high-end appliances when he was doing a new kitchen remodel, so now I have a Miele dishwasher, Subzero fridge, and Wolf all-gas range I’m looking to install in my own kitchen.

The question is - since these aren’t coming from the respective companies or an appliance business - what kind of professional should I be seeking to do these installs?