I honestly wouldn't recommend the product. It didn't work well for me at all. I have a Galaxy S8 and the contact was always interrupted. For me, plugging in with the original cable is faster.

I am not familiar with the 2019 variant. But this model works fine.

Yes, both.

This unit is fast charger 15W also includes cable C-Type and charger But EP-P1100 does not include cable and charger

Yes.

no ! this can ONLY be used for loading!

I have a Samsung Led View Cover and it works perfectly, Note 9 is charged without problems with cover. I'm sure it also depends on the cover type...

According to the samsung homepage, this works without any problems