For an employer, DPSP paid to employees are tax deductible. So where do I report that amount? Also where to report health benefits paid for employees by employer?

Insurance and other benefits provided by an employer are recorded in the Business expenses section of the return - specifically, the section titled How much did you pay in salaries, wages and benefits. Here's a link for more detail: https://www.canada.ca/en/revenue-agency/services/tax/businesses/topics/sole-proprietorships-partnerships/report-business-income-expenses/completing-form-t2125/line-9060-salaries-wages-benefits-including-employer-s-contributions.html