See above question. Since the LoMi mat is used at high heat, can it be considered as becoming kosher between cooking and used for milk after meat and opposite?

Horav Shlomo Miller’s Shlit’a opinion is that one should not use the same Kosher Cooktop Mat for milk and meat since food may fall on it and affect its kosher status. The Rov recommends purchasing two mats, marking them and dedicating one for milk and the other for meat. See similar instructions in the COR Kosher certificate given by Horav Yaakov S. Felder Shlit’a mentioned above.