As ever, feel free to let us know if you would like a guide for a certain IdP currently missing. Also don't hesitate to contact support for questions or other feedback.
ADFS has full support for single logout. Both fully supports both IdP- and SP-initiated logout are fully supported and should work as expected.
See: SLO: AD FS.
GSuite does not support SAML Single logout as an IdP.
Keycloak fully supports SP-initiated Single logout, but to our knowledge does not support IdP-initiated logout.