How to mount company network share?
One solution should fix both issues. You can work around the -1 and -2 issue by unmounting the volumes before disconnecting from the network (sleeping the Mac) or cleaning up in /Volumes before reconnecting. 

The automatic mount is solved by a tool like:


Apple Enterprise Connect
NoMAD open source
JAMF Connect - a commercially supported version of NoMAD


https://nomad.menu is free to use and your company can pay for support if desired. Apple Enterprise Connect is a paid product and Apple engineers come to your business to set it up and provide enterprise support for the tool. You buy it from your Apple sales contact and they can invite your team to a web presentation to see how it works if you wish before buying the tool and services.