iOS Question OTA Deployer without hosted builder???

It means your Hosted Builder Account ID. So if you don't have hosted builder account and you use local mac, then you should use Testflight

I just tossed it on my server and made a manifest file once I learned how it works. That worked fine. Its super easy.

As far a server, you can use any WAMP/LAMP stack with a domain, or one of those dynamic DNS Subdomains, and then use LetsEncrypt to get your Cert.

works great.