I would recommend reaching out to your Veeam Partner/Reseller to help you choose which provider would be best for your needs. The Object Storage partners vary in complexity, ease of use, and price.

You simply add the hosted back-up storage using. The link provided is specific to Object Storage with Immutability, but you can change the 'Program Category' to 'Veeam Ready - Object' if you want to skip immutability (not recommended). Nucleus Veeam Cloud Connect Backup integrates your hosted back-up storage directly in the Veeam back-up console. If you are looking to copy/move existing backup files, already on a local repo, to the cloud, then I would recommend using a SOBR and using a partner in the Veeam Ready database for the Capacity Tier: Depending on your size, you can also run Cloud Connect for the Enterprise (this may be more than you need). It also allows you to do Veeam Replication to a DR site managed by a Cloud Connect partner if you do not already have a site for DR.

Cloud Connect is beneficial if you need to backup directly to a cloud repository (no local repo, no SOBR).

Veeam cloud connect