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Why not? It's top bandwidth consumer for a retail ISP and surely any reasonable amount of rack space is worth the savings in interconnect bandwidth.

They are frequently rack space constrained, hence these super dense hardware.

Some ISPs give a full rack, some don't. It depends on how much traffic they have and how willing they are.

But a lot of the racks sit at internet exchange points, where Netflix rents one or more racks at a time.

The minimum requirements

https://openconnect.zendesk.com/hc/en-us/articles/3600345383...

I think it depends on the size of isp, probably a rack would be too much even for the biggest isps, but one 4u too less.

Looking at the banner pic on their main page, they seem to have at least one ISP install of multiple racks in the wild. Also, doing a little reading on how "fill" of the devices works, they talk about doing peer-to-peer filling of appliances located at the same site, which leads me to believe, even if not deploying a full rack, deploying multiple appliances to an ISP site is a relatively normal occurance

https://openconnect.netflix.com/en/peering/