Job Alerts Automation: Webhooks vs. Starter Plan Options

I'm trying to build out an automation that alerts me whenever someone at one of 16 companies gets a new job or when one of those companies posts a new role. Do I need to go down the webhooks route with the Explorer plan or can it be done with the Starter plan? I am building something as a (free!) favour for a friend and it's turned into quite a tricky thing. Any intel gratefully received. Thanks