Can I store images on my own servers or CDN?

Yes, while a paid plan is active: download renders and keep copies on your own servers, CDN or storage to serve your own products. No separate agreement is needed for that, however many renders your product needs. Those copies remain subject to the terms: they stay Meter's, and they serve your products. Within 30 days after the plan ends, delete them.

To keep a set of images for good, buy an Image Pack: a one-time purchase whose images you may self-host forever, with nothing to delete. What needs a written Enterprise agreement is different in kind: a bulk export delivered as a set, a copy of part of the catalog delivered as one, or any arrangement in which renders are offered on their own. You may never offer renders or models as a standalone library, catalog, archive, asset pack, feed or dataset, resell them separately, build a competing service on them, or use them as training data.