Instant triggers use webhooks internally and are auto-assigned to the Plivo number you select while setting up the workflow. Any other Plivo application that was assigned to that number previously will be removed.
If you need multiple numbers to trigger the same scenario on Integromat, assign all those numbers to the Plivo application that’s auto-created by Integromat.
You cannot have instant SMS and instant call set up simultaneously on a single Plivo number by default. However, you can achieve this by manually changing the webhook URLs — which is recommended only for advanced users.