Yes , for wafer sheets use light tack mat . For supreme icing sheets don't use any mat.
2. Largest size is huge 13x19 sheet. Largest on market.
3. Cleaning cartridges are optional. Use them only when need it or every 3-4 months ( they are reusable ) to refresh print head quality.
4. Same as regular.
5. Ink has 24 months shelf life