Hi Audrius,
You can use the same guide, as the only important part is the redirect to ClearPass. You can either redirect the user to a guest page or to an onboarding page. All the cool stuff, providing the certs and configure the SSID is done on the ClearPass page and the Controller simply acts as an access device.
So simply direct the SSID to the onboarding page instead of the guest page.
BR
Florian