We do not support RHEL yet, however it will be considered on the roadmap if it gets enough votes on uservoice.

Create a suggestion on uservoice: https://digitalocean.uservoice.com/forums/136585-digital-ocean

I have created this as a suggestion in the forum.

See
https://digitalocean.uservoice.com/forums/136585-digital-ocean/suggestions/5128408-rhel

Please vote for it if you like it. It makes it much easier to test for the kind of customers who have enough to lose that they are willing to pay for RHEL (and so have enough to gain that they are willing to pay something for quality).