PSE application: NetMath courses and MITx DEDP micromasters?

I really want to apply to PSE (I'm still working on my bachelor's degree) for either PPD or APE (I'm not too sure what specific field I want to get into yet) and I've been wondering if they would take NetMath self paced courses into consideration.

The thing is my uni only offers strict ready made programs and we only have basic math subjects (major is economics and politics and I am not from the US) so I really wanted to add some rigor.

I've also started auditing the MITx DEDP micromasters and hope to take them officially over the coming semesters - would this count towards my application? Especially if I want to apply to M2 directly?

Do they also require a lot of experience (internships, research etc) or are they more only focused on grades?