My driveway has a slope to it as well. I use the ramps, place them lower on the drive and pull up on them. The car sits nearly level. Good luck trying to get the drain plug by bumping the starter - never worked for me, close but not quite. Easy enough to wrench it over from the crankshaft nut. If under the car, with the rachet handle pointed toward the right side of the car, pushing up will turn the engine clockwise. Have heard tell that turning the engine CCW could cause damage to the timing chain or rails/tensioner. No first hand knowledge though.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.