If working from home in Slovakia, is a self-evaluation required? If so, is there an available template?

No, it is not required under Slovak laws for a supported employee working from home to perform a self-evaluation.

If working from home in Slovakia, is a separate policy or document required?

In Slovakia, telework arrangements for supported employees must be included in the employment agreement. The employer and supported employee can mutually decide if the employee will work fully or partially from a location chosen by the employee, as long as the nature of the work permits such an arrangement.