Using a Hotmat on Pesach

Hi Rabbi,

What is process if any to make a year-round HotMat (https://www.amazon.com/dp/B01E7SU2CQ?ref_=cm_sw_r_apin_dp_EE70CMKBPNZM3SJT5R6E) ok to use on Pesach? If applicable is it ok to do that process during Chol HaMoed of Pesach? Thank you Rabbi.

I don’t see why it’s different than a stovetop. Clean it. Turn it on for 5 minutes

Hi Rabbi. Am I correct to assume this works for even the “warm” parts? This hotmat has 2 Warm [230F] hobs & 2 Hot [338F] hobs. Thank you Rabbi.

Same