I had the same trouble with my ramps - I ended up getting some big cinder blocks from Home Depot and using those to brace the ramps. (They still slid a little, but not as much as when they were unbraced, and it worked well enough.)
I found that by covering the oil filter housing lid with a towel, I could use my standard oil filter wrench to remove it without causing any damage. (I do love the filter-on-top idea, much better than my other cars, where I have to snake my hands in from below.)
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