No this is not possible, for Ad-Hoc distribution you will need to know the UDID of the device on which it will be installed.
The link you provide uses the Enterprise distribution to distribute the app. You are not supposed to have the download of the app publicly available, this is breach of the contract with Apple and could mean that they wil revoke you account. With the Enterprise Account you can on distribute your app to employees of the company for which the account is registered.