If you're concerned then you can go with a system that doesn't require a bolted single tank adapter, but those bolts and wing nuts are standard on all doubles and are recessed in the channel of the backplate itself.
Unless you have a particular reason to get Zeagle if it's part of a uniform, you would be hard pressed to beat this deal from
@DiveGearExpress which has a design that doesn't require a bolted single tank adapter as well.
A basic DGX backplate/wing/harness package for single tank diving at a value price.
www.divegearexpress.com