Combining different DC power supplies
A1: 1A.
A2: No, regardless of what kind of AC input it has, earthed or not, the DC output on at least one supply must be floating/isolated from ground/earth.
But I would not recommend connecting these in series. If you exceed the 1A limit then the 1A supply might shut down. If one of the supplies is off, the other supply would apply voltage via load to the shut down supply. E.g. if you turn on the 36V supply first and have a high power load or short circuit, almost all of the 36V would be in parallel over the 12V supply, and it would most likely get damaged.