Render image from set locations.

[DaveRig]

I'm looking for a way to render thumbnails of a mesh from 4 set locations.
The 3d Meshes will have +Z facing up so would like to have 4 locations (1,0,0), (-1,0,0), (0,1,0), (0,-1,0) all with the cameras facing 0,0,0

Any idea on the matrix math to snap a camera to these locations and facing?
Also is there a way to set the resolution of the render or is it fixed to the sensor size of one of the camera?

Thanks.