Bare Metal OS Deployment Server issues

Is there a way to install the bare metal OS Deployment Server on just one relay? We have 300+ Relays in our environment and I don’t want to put a server on all of them.
I have tried exposing the site to only to the 1 relay, but it still shows Install (4) in the wizard.
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Yes…that “install” button creates the action to install the bare metal server; once you click it, you can choose the targets (on which relays are to add Bare Metal Server)

Thanks. Just didnt wanna kick off an install to all relays. Usually “Install” means well… Install.