Shelly EM contactor control

I have a shelly em hooked up to my consumer unit that tells me my consumption and also a breaker like the below for my EV charger

The plan is to make my EV charger smart with the shelly em contactor control by using the shelly em to control when the EV charger gets power and when it is not.
I want to automate the on/off based on solar PV output and if I’m exporting too turn on the breaker then turn it off.

As I understand this I need an extra contactor relay that I wire the shelly em wire to and then wire the relay to my 20a breaker above which will power it on/off

I am I understanding that correctly?