Ring Doorbell 3 Resistor

Hello! I recently purchased the Ring Doorbell 3. I’m in the process of completing my setup by connecting it to a transformer without a preexisting doorbell mechanism. It says in the manual that a resistor is recommended for this configuration. I found that for Ring Doorbell 2 it’s adamantly required to avoid fires, but I can’t seem to find any clear info on model 3 beside that brief mention in the manual. Has anybody hooked theirs up this way and can offer guidance? Thanks!