ready to install antenna and router, but lots of ???

Your antenna isn't tall enough to worry about mounting it on the drivers side.

My six years experience with a Pepwave Max BR-1 has shown very sufficient performance with antennae on the roof, no pole mount. The only advantage of a pole would be if you're blocked by solid buildings or terrain; you'd have to be sure you're not intrducing too much coax loss. BTW, use LMR-400 coax.