Usually EPP are managed through the company, and fulfilled by specific retailers. The cost of the plan is standardized, and phones may be more expensive than on regular retail plans, due to the service discount. The EPP plan may also be a longer term to completion, as it is not a consumer plan. EPP often don’t include the option to add other devices to the plan, so if having a watch or other device as part of your plan is important for you, an EPP may not be the best choice.
If you have been given a specific contact by your employer, that is who you should connect with, as it is likely a specific department.