Azure App Service Pricing. This offers a much more flexible solution than azure app service. These tiers allocate cpu quotas to each app that runs on the shared.
All other plans can have unlimited; App service plan tiers pricing. You don't pay per app service.
Within app service, hybrid connections can be used to access application resources in other networks.
There are still servers in a datacenter that run your application; The azure vm is where your web app run. With asev3 you just pay for the isolated v2 sku rates for your app service plans. From the left navigation of your app, select tls/ssl settings > private key certificates (.pfx) > import app service certificate.