How to do bulk upload of the GPS co-ordinates of meters, but actually not the GPS co-ordinates, but the street address, resulting in GPS co-ordinates?

I think the following should work: You'd do the bulk edit, and generate a spreadsheet for the screen.
Then edit the spreadsheet, taking out the lat and lng columns, and adding a geocodestr column, which is your address, e.g. '14 Partridge Avenue, Kempton Park, Gauteng, South Africa', or something like that.
To experiment with that, go to the Edit->Physical Location and play with the geolocation and see how accurate it is, or not, for your scenario.

If it is in approximately the correct place, but you want to position it exactly right, you can of course click and drag the flag in the Edit->Physical Location screen.