We use the Eventide MixingLink for our vocal pedal demos.  It is a flexible and pedalboard friendly way to process vocals or any miced instrument.  Several other companies make similar mic preamp/effects loop pedals (we know of Radial, Old Blood Noise, and Cusack as of 2022).  Most provide phantom power, but verify that if your microphone requires it.

You can also use a standalone microphone preamp or a mixer with the pedals on a channel insert or effects send/return.  If you use an effects send/return, the last pedal in the chain should use the 'kill dry' bypass mode to avoid phase issues.