Shared Resources & Build Trigger Logic

My project:

• uses 2 build agents
• uses 2 environments for testing (auto1 and auto2)
• have declared test environments (auto1 and auto2) as Shared Resources

Trying to figure this out:

• If a build is triggered for auto1, then subsequent requests for auto1 needs to be queued
• If two builds are triggered for auto1 and auto2, simultaneously, then both can be run in parallel

Really appreciate the help! Thanks.