Understanding Fees for Self-Managed DV360 Licenses Through Resellers

I'm trying to determine the costs involved if we decide to obtain a DV360 license through a reseller, with plans to manage it internally. Essentially, we just need access to the platform without any managed services. I'm curious to know what fees we should expect. Is it typically around the 10-15% range as I have commonly heard, or could there be a possibility of it being lower since we won't need additional services? For some context, our product experiences seasonal fluctuations; we intend to allocate six-figure monthly budgets during peak months and none during off-peak periods. Our primary focus is on acquiring CTV inventory in Germany along with YouTube integrations.