Dynamics 365 For Finance and Operations On premise Deployment SSIS and Azure requirements

Hello everyone,

We are planning to deploy D365 on premise. 

Reading Microsoft’s documentation on D365 installation, it seems to imply that we need to install SQL Server Integration Services on all AOS servers in the installation, which would mean that we actually need to buy four licenses of SQL Server, one for each literal SQL server and one for each AOS.

 https://docs.microsoft.com/en-us/dynamics365/unified-operations/dev-itpro/deployment/setup-deploy-on-premises-environments#setupssis

Is this an only way of doing that or can we share SSIS between all AOSs?

My second question is 

As per the comments on the bottom of the following article, it seems to imply that we also need an Azure subscription in order to host our Tier 1 Build VM 

https://docs.microsoft.com/en-us/dynamics365/unified-operations/dev-itpro/deployment/on-premises-overview

Is this true? , Wouldnt this be downloaded via LCS.

Regards,