On my FRC I use Rhino ramps with some 2x4 on the floor in front to raise the car enough so the bottom doesn't scrape. It still touches the ramps a bit, and will probably build up something more to get the front off the floor a little more.
From here I use a 3/8" drive socket to remove the drain plug. If the socket is placed on the plug first and then the drive attached after a socket can be used.
While the oil is draining I use two floor jacks. One at a jack point in front of the rear wheel is used to get the rear of the car up enough to get a second jack under the rear crossmember. My second jack is a lower profile jack. Then I jack the rear of the car up a little higher than the front and allow the rest of the oil to drain.
Once it's done, I lower the rear, change the filter and add the oil. A little more involved than a normal vehicle, but not hard at all.
Leon