Serbinski Accounting Firms

what if I commute to US to work and go back to live in Canada, cause I just live close to the border?

They don't want to setup the payroll in Canada I think, and only want to sponsor me TN-Visa, how can I handle the EI/CPP in this situation?

I got an offer from US company recently and can sponsor me for TN visa and allow remote work, I'm wondering what tax implication are there if I work in Canada most of the time? and because the CPP and EI are not collected, is there any problem?